The fonds predominantly consists of project files for the various engagements that MASS LBP undertook for a variety of clients from the beginning of the organization up to 2020. There is also material relating to the running of the partnership, a series of letters and responses for participation in the Civic lottery process and a series of Reports on completed works..
The fonds consists of correspondence pertaining to publications of the Society or colloquiems sponsored by the Society; minutes of the Council; subject files relating to bibliographies on a number of subjects as well as files on publications; constitutional material; publications; book reviews and proofs; members' photographs and photographs of events; miscellaneous material.