This post has a very long list of Free Art Books. You can see the entire list after the jump. Just hit “more”.
Bridgman, George B., 1939. The Human Machine.
http://www.archive.org/details/human…ethea009564mbp
Bridgman, George B., 1920. Constructive anatomy
http://www.archive.org/details/const…anat00briduoft
Blake, Vernon, 1927. The Art And Craft Of Drawing
http://www.archive.org/details/artan…ofdra027904mbp
Crane, Walter, 1914. Line & Form.
http://www.archive.org/details/lineform00cranuoft
De Laszlo, 1934. Painting a Portrait.
http://www.archive.org/details/paint…rtrai000674mbp
Eastlake, Sir Charles Lock. Methods And Materials Of Painting Of The Great Schools And Masters
Volume One
http://www.archive.org/details/handb…inti01kugliala
Volume Two.
http://www.archive.org/details/metho…ateri011267mbp
Guptill, Arthur Leighton,1922. Sketching and Rendering in Pencil.
http://www.archive.org/details/sketc…deri00guptuoft
Holmes, C. J. 1920. Notes on the science of picture-making.
http://www.archive.org/details/notes…ceof00holmuoft
Poore, Henry Rankin, 1903. Pictorial composition and the critical judgment of pictures.
http://www.archive.org/details/picto…posi00pooruoft
Ross, Denman Waldo, 1907. A theory of pure design; harmony, balance, rhythm.
http://www.archive.org/details/theor…desi00rossuoft
Ruskin, John. The elements of drawing (1920 edition).
http://www.archive.org/details/elementsofdraw00ruskuoft
Richter, Jean Paul, The literary works of Leonardo da Vinci (Volume 1 and 2).
The same illustrated edition of Leonardo notebooks that was reprinted by Dover.
http://www.archive.org/details/liter…sofl01leonuoft
http://www.archive.org/details/liter…sofl02leonuoft
Stone, Irving And Jean, 1962. I, Michelangelo, Sculptor (Michelangelo’s Letters).
http://www.archive.org/details/IMichelangeloSculptor
Whistler, James McNeill, 1909. The gentle art of making enemies, as pleasingly exemplified in many instances, wherein the serious ones of this earth, carefully exasperated, have been prettily spurred on to unseemliness and indiscretion, while overcome by an undue sense of right.
http://www.archive.org/details/gentl…akin00whisuoft
Ludovici, Anthony Mario, 1912 – The letters of a post-impressionist; being the familiar correspondence of Vincent van Gogh.
http://www.archive.org/details/lette…timp00goghuoft
Gauguin, Paul, 1919. Noa Noa. Translated from the French by O.F. Theis.
http://www.archive.org/details/noano…ated00gauguoft
Vasari, Giorgio. Lives of the most eminent painters, sculptors & architects (complete in ten volumes).
http://www.archive.org/details/lives…mine01vasauoft
to
http://www.archive.org/details/lives…mine10vasauoft
Clark, Kenneth, 1952. Leonardo Da Vinci An Account Of His Development As An Artist.
http://www.archive.org/details/leona…incia013645mbp
Hind, Charles Lewis. Drawings of Leonardo da Vinci.
http://www.archive.org/details/drawi…onar00leonuoft
Mount, Charles Merrill, 1955. John Singer Sargent – A Biography.
http://www.archive.org/details/johns…argen000439mbp
Marillier, H. C. 1912. The Early Work of Aubrey Beardsley.
http://www.archive.org/details/early…hpre00bearuoft
The later work of Aubrey Beardsley.
http://www.archive.org/details/later…ubre00bearuoft
Quennell, Peter, 1955. Hogarth’s Progress.
http://www.archive.org/details/hogar…gress011296mbp
Clapp, 1916 – Jacopo Carucci da Pontormo, his life and work.
http://www.archive.org/details/jacop…idap00clapuoft
Panofsky, Erwin, 1955. The Life and Art of Albrecht Durer.
The classic study of Durer
http://www.archive.org/details/lifea…falbr000686mbp
Strange, Edward Fairbrother, 1906. Hokusai, the old man mad with painting.
http://www.archive.org/details/hokus…nmad00strauoft
Whistler (lots)
http://www.archive.org/search.php?qu…201834-1903%22
Clark, Kenneth. The Romantic Rebellion.
http://www.archive.org/details/TheRomanticRebellion
Clark, Kenneth, 1949. Landscape into Art.
http://www.archive.org/details/lands…toart000630mbp
Panofsky, Erwin, 1955. Meaning In The Visual Arts – Papers In and On Art History.
http://www.archive.org/details/meani…evisu010505mbp
10 works illustrated by NC Wyeth .
http://www.archive.org/search.php?qu…0Convers%29%22
30+ works illustrated by Howard Pyle (+ 10 on Gutenberg).
http://www.archive.org/search.php?query=howard%20pyle
28 works by, or illustrated by Walter Crane.
http://www.archive.org/search.php?qu…iatype%3Atexts
EDIT: Check below the dotted line for new recommendations
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Pen Illustration
Maginnis, Charles. Pen Drawing – An Illustrated Treatise
http://www.gutenberg.org/etext/17502 (4.9 MB zip)
Sullivan, Edmund J. 1921. The Art Of Illustration.
http://www.archive.org/details/TheArtOfIllustration
Sullivan, Edmund J. 1922. Line – an art study
http://www.archive.org/details/lineartstudy00sulluoft
Books illustrated by Arthur Rackham
Goblin Market (scanned by chaosrocks)
http://s39.photobucket.com/albums/e1…1166111935.pbw
http://s39.photobucket.com/albums/e1…1166111772.pbw
http://s39.photobucket.com/albums/e1…1166111696.pbw
Vernon Jones, V. S.1916. Æsop’s fables : a new translation. (Rackham, Arthur, illustrator)
http://www.archive.org/details/aesopsfables00chesuoft
Gates, Eleanor, 1907. Good-night (Buenas noches).
http://www.archive.org/details/goodn…nasn00gateiala
Morley, Christopher, 1922. Where the blue begins.
http://www.archive.org/details/where…ebeg00morlrich
Ibsen, Henrik, [19–?]. Peer Gynt: a dramatic poem.
http://www.archive.org/details/peerg…atic00ibseuoft
Stephens, James, 1920. Irish fairy tales.
http://www.archive.org/details/irish…ales00steprich
Fitz-Gerald, S. J. Adair (Shafto Justin Adair),1896. The Zankiwank & the Bletherwitch.
http://www.archive.org/details/zanki…ther00fitziala
Evans, C. S., 1920. The sleeping beauty.
http://www.archive.org/details/sleepingbeauty00evanrich
More Rackham
http://www.conceptart.org/wiki/doku….ator_1867-1939
Architecture
Robinson, John Beverley, 1914. Architectural Composition (found by Farvus)
http://www.archive.org/details/ArchitecturalComposition
Other architectural highlights include 50+ elaborately illustrated volumes of the journal known successively as Architecture, American architect and architecture, and Architectural record:
http://www.archive.org/search.php?qu…3Atexts&page=1
plus numerous volumes both on the history of architecture in general, and on specific styles including Egyptian, Greek, Byzantine, Norman, Gothic, Romanesque, Medieval, Muslim, Indian … Just use the search button.
Books on the imagination (found by chronologic; reviewed by armando here)
Ribot, Th. 1906. Essay on the creative imagination.
http://www.archive.org/details/essay…eati00ribouoft
Rhoades, James, 1908. The training of the imagination.
http://www.archive.org/details/train…agin00rhoauoft
Composition
Dow, Arthur Wesley, 1913. Composition; a series of exercises in art structure for the use of students and teachers.
http://www.archive.org/details/compo…erie00dowauoft
Fashion (from Farvus)
Ellsworth, Evelyn Peters, 1917. Textiles and costume design
http://www.archive.org/details/texti…umed00ellsrich
Traphagen, Ethel, 1918. Costume design and illustration
http://www.archive.org/details/costu…nill00trapiala
More Artists and their works
Heermann, Norbert, 1918. Frank Duveneck
http://www.archive.org/details/frankduveneck00heeruoft
Roof, Katharine Metcalf, 1917. The life and art of William Merritt Chase
http://www.archive.org/details/lifea…liam00roofiala
Cox, Kenyon, 1914. Winslow Homer
http://www.archive.org/details/winslowhomer00coxkuoft
Inness, George Jr,, 1917. Life, Art and Letters of George Inness.
http://www.archive.org/details/lifea…etter005237mbp
Hartmann, Sadakichi, 1910. The Whistler book; a monograph of the life and position in art of James McNeill Whistler
http://www.archive.org/details/whist…mono00hartiala
Macfall, Haldane, [1906?] Whistler
http://www.archive.org/details/whistler00macfiala
Furst, Herbert, 1920. Frank Brangwyn, R.A (woodcuts)
http://www.archive.org/details/frank…ynra00braniala
Sparrow, Walter Shaw, 1915. A Book of Bridges (illustr. Brangwyn)
http://www.archive.org/details/booko…sspa00sparrich
Brooklyn Museum, 1921 – Historical paintings of the Slavic nations (Mucha’s Slav Epic)
http://www.archive.org/details/histo…inti00muchiala
Books with illustrations by N.C. Wyeth
The throwback : a romance of the Southwest (1906)
http://www.archive.org/details/throwback00lewirich
Arizona nights (c1907)
http://www.archive.org/details/arizonanights00whitrich
Whispering Smith (1908 [c1906)
http://www.archive.org/details/whisp…mith00spearich
The song of Hiawatha (c1908 )
http://www.archive.org/details/songofhiawatha00long2
Susanna and Sue (c1909)
http://www.archive.org/details/susannasue00wigg
The long roll (1911)
http://www.archive.org/details/longrollmary00johnrich
Treasure Island (c1911)
http://www.archive.org/details/treasureisland00stev
Cease firing (1912)
http://www.archive.org/details/ceasefiring00johnuoft
The sampo; a wonder tale of the old North ([c1912])
http://www.archive.org/details/sampowondertaleo00bald
Blackfeet Indian stories (c1913)
http://www.archive.org/details/blackfeetindians00grin
Letters of a woman homesteader (1914)
http://www.archive.org/details/lette…anho00stewuoft
The drums of the 47th (c1914)
http://www.archive.org/details/drumsof47th00burd
Nan of Music Mountain (1916)
http://www.archive.org/details/nanofmusic00spearich
The mysterious stranger : a romance (1916)
http://www.archive.org/details/myste…nger00twairich
The black arrow : a tale of the two Roses ([c1916])
http://www.archive.org/details/blackarrowtaleof00stev
Robin Hood (1917)
http://www.archive.org/details/robinhood00cresrich
The last of the Mohicans : a narrative of 1757 (1919)
http://www.archive.org/details/19lastmohicans00cooprich
Robinson Crusoe (1920)
http://www.archive.org/details/robinsoncrusoe00defo
The courtship of Miles Standish (1920)
http://www.archive.org/details/courtshipofmiles001long
Rip Van Winkle (c1921)
http://www.archive.org/details/ripvanwinkle00irvi
Poems of American patriotism (c1922)
http://www.archive.org/details/poemsofamericanp00matt
Vandemark’s folly (c1922)
http://www.archive.org/details/vande…olly00hawtrich
Chapman’s American Drawing Book (added by patdzon)
Chapman, J.G. (John Gadsby), 1847. The American drawing-book: a manual for the amateur, and basis of study for the professional artist: especially adapted to the use of public and private schools, as well as home instruction.
http://books.google.com/books?id=NdAEAAAAYAAJ (1847 edn: 168 pp.)
http://digital.library.pitt.edu/cgi-…ew=toc;c=nietz (1847 edn: 168 pp.)
http://books.google.com/books?id=BoQEAAAAYAAJ (1858 edn: 304 pp.)
http://digicoll.library.wisc.edu/cgi….I0001&isize=M (1870 edn: 320 pp)
Perspective
Loomis, Andrew, 1951. Successful Drawing.
http://acid.noobgrinder.com/Loomis/A…%20Drawing.rar (direct download link)
Storey, G. A. The Theory and Practice of Perspective.
http://www.gutenberg.org/files/20165/20165-h.zip (direct download link)
Watson, Ernest W., 1955. How To Use Creative Perspective.
http://www.archive.org/details/howto…ative036957mbp (poor scans)
Longfellow, William Pitt Preble, 1901. Applied perspective, for architects and painters.
http://www.archive.org/details/appli…ecti00longrich
Miller, Leslie William, 1887. The essentials of perspective, with illustrations drawn by the author.
http://www.archive.org/details/essentialsofpers00mill
Great collection of scholarly articles on history of perspective (Kim H. Veltman):