The bulk of the collection consists of collected ephemera about and correspondence with, the underground artists whose work Erwin and Alfred Bergdoll collected. The correpondence mostly dates from the 1970s, 1980s and 1990s and it is notable how much of it is between Kim Deitch and the brothers. Other artists who feature significantly in the correspondence are Justin Green, Bill Griffith, Rory Hayes, Art Spiegelman and Aline Kominsky Crumb.

The collection also contains the many comics catalogs from the 1970s and 1980s that the brothers used in their collecting. There are also reviews, clippings, flyers and information from newspapers and galleries on mainly comics related topics but also on primitive and folk art.

The woodblocks they commissioned for their press, the 'Pray Curser Press' are here as are a collection of postcards by Drew Friedman and Kim Deitch published by Glenn Bray.