Quick help for a difficult question
in the U.S. on April 19, 1956?
I would come up to the reference section and look for the New York Times theater reviews PN2266.N48
There is also a book in the SLIS library called
"How to locate reviews of plays and films : a bibliography of criticism from the beginnings to the present"
School of Library and Information Science Library
PROF 016.791 S192h