This collection primarily contains materials related to the activity of Stephen Welhasch in the organizations Prolog Research, Prolog Video, the Committee for the Defense of Soviet Political Prisoners (CDSPP), the Ukrainian Supreme Liberation Council (Ukrains'ka Holovna Vyzvol'na Rada, UHVR), and the "Chetver" Ukrainian radio program, as well as his desk notes, mailings from various organizations, and ephemera. Also included are 5 mini-DV video tapes, 3 CD-R discs, and one SD card with currently undetermined contents.

The business records of CDSPP are extensive, including mailings, notes, activity lists, meeting agendas/minutes, and annual reports. It also has responses generated by a 1973 New York Review of Books "open letter" advertisment, as well as records related to the organization of a March 1979 fundraiser with N. Svitlychna and Gen. P. Grigorenko. There is also a significant quantity of records related to the "Chetver" ("Thursday") Ukrainian radio program in New York City, including scripts, runs of show (with names and timings of segments, presenters, etc.), research and writing, sponsorship and advertising information, and other related materials.

Beside these, there are organization-related photographs, including ones that appear to have been taken in Ukraine in the early 1990s, materials related to Roman Kupchyns'kyi (including materials related to his funeral), unused UHVR letterhead stationery, copies of the "Informatsiinyi lystok" created by the Zakordonne Predstavnytstvo UHVR and the Radio Free Europe Research publication, extensive newspaper clippings and published materials.

In addition, there are personal and household records, correspondence (some of which may be personal or third party), incoming organizational mailings addressed to Salamacha family members, and Welhasch's funeral eulogy for Iaroslava Salamacha.