Books by Darrell I. Leap:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Leap, Darrell I.: Geology and water resources of Brown County, South Dakota (Science Center, University of South Dakota, 1986), also by Oahe Conservancy Sub-District (S.D.) and South Dakota Geological Survey (page images at HathiTrust)
Find more by Darrell I. Leap at your library, or elsewhere.