The largest archive of Tram’s letters and writings is at the University of California, San Diego.
Tram Combs Papers, 1946 – 1964 (MSS 0123)
The University of Delaware has a great collection of Tram’s correspondence, mostly with John Brinnin. Brinnin was a good friend and important advocate of his poetry.
Tram Combs Correspondence
In the 1960s, Tram was working on a history of the post-war San Francisco poetry scene. He donated his papers related to this history to UC Berkeley.
Tram Combs papers : and other material, 1956-1973
UC Berkeley has most of Tram’s Correspondence with Lawrence Ferlinghetti.
Lawrence Ferlinghetti correspondence with Tram Combs, 1957-1964
I recently discovered the Social Networks and Archival Context (SNAC), which organizes archives of historical figures.
Tram Combs on SNAC
WorldCat lists 48 items for Tram.
Tram Combs on WorldCat