Searching OCLC, the biggest bibliographic database in the world, I found
the title "List o zagladzie Zydow w Drohobyczu" at the following libraries:
Stanford University and Hoover Institute, Palo Alto, CA
Los Angeles Public Lib.
Central Connecticut State University
Yale, Harvard, Cornell Universities
Library of Congress
US Holocaust Memorial Museum
Univ. of Florida, Gainesville
Hebrew Union College, Cincinnati
Univ. of Pittsburgh
Alliance College, Cambridge Springs, PA
Univ. of Alberta
Cambridge, Oxford Universities
Trinity College, Dublin
University of London
in addition to the British Library (yes, in London). I actually didn't see
that there was a copy at the Univ. of Toronto (my alma mater), but they
might not post that info in OCLC.
Good luck in tracking down a copy.