Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002.
3:
Vol. 50 (1955); title from title screen (viewed December 23, 2014).
4:
Vol. 90 (2014) (usnwc.edu website, viewed October 7, 2014).