The dunes of northwestern Indiana,
by A.F. Knotts ... "Photos taken by H.H. Daugherty, Gary, Ind."
- [Gary? 1917]
- 20 p. illus. (incl. maps) 23 cm.
"Prepared for and published in Indiana Geological Report, 1916." [Forty-first annual report of Department of Geology and Natural Resources, Indiana, p. 11-27]