The collection is divided into fifteen series: Keepsakes, Broadsides, Chapbooks and Pamphlets, Illustrations, Prints, and Photographs, Brochures and Leaflets, Correspondence, Cards and Invitations, Menus and Programs, Bookmarks, Periodicals and Newsletters, Catalogs, Printing Artifacts, Framed Items, and Miniatures. Materials come from not only Regis Graden's Nut Quad Press, but also the Grabhorn Press, Grabhorn-Hoyem, Arion Press, Clinker Press, John Henry Nash, Blackwood Press, Black Vine Press, Año Nuevo Press, Lone Goose Press, Quail Hill Press, Sagebrush Press, Pequeño Press, Hill and Dale Press, Anchor & Acorn Press, and many others.

The Keepsakes series consists of various formats including leaflets, chapbooks, and broadsides printed to commemorate events such as joint meetings of the Roxburghe and Zamorano Clubs, and other special occasions.

The Broadsides series consists of posters printed to advertise events, as well as for artistic purposes, many printed letterpress.

The series of Chapbooks and Pamphlets includes chapbooks and shorter pamphlets printed by various presses. Subjects include poetry, speeches reprinted as booklets, and various other topics that have been printed and bound in a paper cover.

Illustrations, Prints, and Photographs is a small series of mainly engraving prints done by fine presses, including four original John De Pol wood engravings, a highlight of the collection.

Brochures and Leaflets includes leaflets printed at fine presses to announce upcoming publications, leaflets printed by paper and type companies to advertise their wares, as as well as brochures and guides from museums. Correspondence includes letters from May Morris and the Luther Burbank Society.

Cards and Invitations includes invitations to private sales, holiday greetings from different presses, invitations to presentations, and postcards. The subseries for The Book Club of California and the Zamorano Club are arranged chronologically.

Menus and Programs contains the the beautifully printed programs and menus created for the meetings of the Roxburghe and Zamorano Clubs, American Printing History Association meetings, and other celebrations.

Bookmarks is a small series, of letterpress bookmarks, primarily produced by Andre Chaves at the Clinker Press.

Periodicals and Newsletters is divided into three subseries. The first containing periodicals, the second newsletters from presses and associations, and the third consisting of clippings from newspapers and signatures from bound periodicals, as well as incunabula… for some reason.

Catalogs are arranged into three subseries, each with catalogs of different types. The first consists of catalogs from sales, presses, and exhibitions. The second consists of directories, listing fine presses and contact information for members of the American Printing History Association, and the third subseries includes catalogs of type specimens in the form of both books and single sheets.

Printing Artifacts is broken down into two subseries, the first consisting of printed industry materials such as instructional manuals, and the second subseries consisting of items used in the physical process of printing such as moveable type.

Miscellaneous consists of only two items, the diary of Benjamin Franklin Kopf from 1912, an affidavit from 1879, and a digital recording of the oral history of printer Richard J. Hoffman.

Framed Items consists of incunabula from the mid 15th century, a leaf from the Kelmscott Chaucer, a collection highlight, mounted and framed, other interesting printed items, as well as portraits of printers with their presses.

Miniatures consists of items, mostly books that under five inches, the majority were produced by Monsignor Francis J. Weber at the Junipero Serra Press, Robert E. Massmann at the Art Press, and John Lathourakis at the Tabula Rasa Press. Many were printed as keepsakes for the Miniature Book Society Grand Conclaves. Subjects range from biographies of printers, California history, and religion.