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Per the Help Center:
Coloring Books: NO
Single-Issue Comic Books: NO
Anything that is not a book: NO
Last Edited on: 3/13/10 6:52 PM ET - Total times edited: 1
Coloring and activity books are unpostable. IIRC workbooks are a gray area but postable if include educational content other than coloring. Some members really like the artsy type coloring books (unused), but it's iffy for postability.