The fonds consists of records related to Thomas's activities as a politician, UBC professor, and community activist.
The fonds is arranged into series based on Thomas's activities. Records relating to the NDP have been divided into the New Democratic Party of Canada series, the New Democratic Party of British Columbia, Point Grey series and the New Democratic Party Vancouver Area Council series. There are also separate New Democratic Party Participation of Women Committee and New Democratic Party of British Columbia Standing Committee on Women's Rights series.
The fonds also contains records related to Thomas's activism in many areas. Thomas was an active member of many activist organizations, and these organizations comprise the Committee to Defend Political Prisoners in Quebec series, the Endowment Lands Regional Park Committee series, the BC Federation of Labour series, the Women's Selection Committee for Women's Health Advisory Committee to the Vancouver Health Board series, and the BC Federation of Women series.
Thomas also kept subject files and correspondence related to her activism that included material from several organizations, or from none. These records have been grouped into series based on the subject, including the Vietnam War series, the Women and Peace series, the Human Rights series, the Feminism Subject Files series, the Anti-nuclear war subject file series and the Labour Activities subject file series.
The fonds contains records from Thomas's time as a professor in the University of British Columbia series. Student essays written by Thomas are in the Student essays series. Thomas's research on Malcolm Lowry comprises a separate series.
Finally the fonds contains the Everywoman's Health Centre series.