The Library of Congress has the 1938/1939 Warsaw telephone directory
and a 1923 commercial directory for all of Poland and Gdansk at
https://www.loc.gov/rr/european/pdir/index.html. Brest-Litovsk was
part of Poland in 1923.
Megan Lewis Reference Librarian
NOTE: I am teleworking until further notice.
National Institute for Holocaust Documentation
United States Holocaust Memorial Museum