101 Enterprises operated out of New York from 1967-69. During that time they published 48 books and I managed to find covers for all of them.
These books were not bound; they did not have a spine. Rather, they had a graphic wrap (a cover) and were held together with centered staples.
The artwork varied greatly, and included crude drawings, and 'borrowed' images and illustrations.
All the authors wrote under pseudonyms in order to avoid prosecution. Many of the pseudonyms were one-offs and untraceable.