Books by Heidi A. Langrehr:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Langrehr, Heidi A.: A summary of water quality characteristics at selected habitat sites in Navigation Pool 8 of the Mississippi River for 1 January-30 December 1989 (The Center, 1992), also by Scott M. Schellhaass, Long Term Resource Monitoring Program (Environmental Management Program), Environmental Management Technical Center (U.S.), and U.S. Fish and Wildlife Service (page images at HathiTrust)
Find more by Heidi A. Langrehr at your library, or elsewhere.