by William J.W. Roome; with thirty-two pages of illustrations from photographs by the author and a map., Includes index., Main Heritage Shelves General, DT12 R55 1930, Book, Item-ID: i10232370, BIB-ID: 1024873
by Harry Emerson Fosdick., Includes indexes., Main Heritage Shelves General, DS107.3 .F67 1930, Book, Item-ID: i10042611, BIB-ID: 1006064, Includes bibliographical references (p. 295-297).