BEIN Pforzheimer Intelligence 6006: Paperbound. Accompanied by manuscript note of Walter L. Pforzheimer noting date, price, and place of purchase. From the library of Walter L. Pforzheimer.
BEIN Pforzheimer Intelligence 6021: Paperbound. "Third printing, June 1960." Bookseller's stamp: Carl Holmer. From the library of Walter L. Pforzheimer.