Robert Dale Owen, 1940: title page (Richard William Leopold)

Info. converted from 678, 2012-10-02 (b. 1912)

Contemporary authors, volumes 1-4, first revision, 1967: (Richard William Leopold, b. Jan. 6, 1912)

OCLC, Jan. 25, 2019: (usage: Richard W. Leopold)

Northwestern University, Nov. 29, 2006: (Richard W. Leopold of Evanston, Ill., a prominent diplomatic historian whose teaching and scholarship guided students and colleagues during an illustrious career at Northwestern University, died of natural causes Nov. 23, 2006) https://www.northwestern.edu/newscenter/stories/2006/11/leopold.html