Series II. Writings and Publications consists of four subseries. Subseries A. Published Manuscripts includes manuscripts of published works. The papers in this collection include brief citations, excerpts, and drafts with written notations and pages that have been cut and pasted. The title with the greatest volume, Midwinter Rites of the Cayuga Longhouse, has been categorized separately and organized according to chapter. Some photographs included in this title have been classified as culturally sensitive and restrictions on reproduction have been applied to these materials. All other manuscripts of published works that are lesser in volume have been included in the subsection "Other Published Manuscripts" and have been organized chronologically. Subseries B. Unpublished Manuscripts includes manuscripts of unpublished works and related research material. The titles with the greatest volume have been categorized separately. Two works in this collection include authors additional to Speck. The first is a manuscript titled Art and Art Ways of the Naskapi Indian co-authored by Speck and his colleague, Ernest S. Dodge, former director of the Peabody Essex Museum in Salem, Massachusetts. This manuscript includes a letter from Birket-Smith to Speck, anlong with notes by "W.N.F." The second is titled Naskapi Art, which was written by scholar Alika Podolinsky Webber, and includes excerpts from Speck and Dodge's unpublished manuscript, Art and Art Ways of the Naskapi Indian. All other manuscripts of unpublished works that are lesser in volume have been included in the sub-subseries, "Other Unpublished Manuscripts" and have been organized chronologically.

Subseries C. Lecture Notes and Materials includes Speck's typed and handwritten lecture notes, teaching materials and related sources on Indigenous peoples, linguistics, ethnology, and archaeology. Subseries D. Publications includes printed publications written by Speck.