[PW] Holocaust as a library subject heading?

[Reference]

A patron came to me today with a two-pronged
question: when did the term "Holocaust" become a
popular term for the Nazi extermination of Jews,
and when did "Holocaust" become a formal subject
heading for library collections? 

The first part was easy enough, but I drew a
blank on the subject heading question. We don't
keep LCSH archives in our branch, or the Sears
list. Can anyone tell me how she can find the
information? Thank you!

Barb




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