Aaron Higgins of Toonarific has started a new website devoted to cataloging classic coloring books. As an art resource, it’s invaluable as the site is showcasing and preserving coloring book art since the 1930s. Higgins’ RetroReprints site is a guide to what books have been published over the years, and he is slowly adding images under the books themselves for users to download and color. He is also reformatting the images and creating complete ebooks, also available to download.
And in case you were wondering where you could buy vintage coloring books of your favorite characters, Aaron also has over 1000 coloring and activity books for sale here on ebay.