Very interesting, and the book mentioned is Our Crowd, and found 2 on used books online:
"Our Crowd": The Great Jewish Families of New York
BIRMINGHAM, STEPHEN
https://www.abebooks.com/Crowd-Great-Jewish-Families-New-York/32115508901/bd
Our Crowd; the Great Jewish Families of New York
by Stephen Birmingham - "Our Crowd" is Stephen Birmingham's #1 New York Times-bestselling history of the rise of the most powerful and privileged Jewish families in America. This description may be from another edition of this product.
January 1967
this one has a similar cover than the first:
https://www.thriftbooks.com/w/quotour-crowdquot-the-great-jewish-families-of-new-york-modern-jewish-history_stephen-birmingham/376390/?resultid=4934cc65-28fb-42d0-b39b-6212621ffda4#edition=6147861&idiq=10141442
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