Books by M. A. Ayers:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Ayers, M. A. (Mark Alan), 1948-: Runoff and chemical loading in small watersheds in the Twin Cities metropolitan area, Minnesota (U.S. Dept. of Interior, Geological Survey ;, 1985), also by Gary L. Oberts, R. G. Brown, Geological Survey (U.S.), and Metropolitan Council of the Twin Cities Area (page images at HathiTrust)
Find more by M. A. Ayers at your library, or elsewhere.