Books by P. K. Kovacic:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Kovacic, P. K.: Effects of chlorine and sulfite reduction on Lake Michigan invertebrates (U.S. Environmental Protection Agency, Office of Research and Development, Environmental Research Laboratory ;, 1976), also by Alfred Merle Beeton, A. S. Brooks, University of Wisconsin--Madison. Center for Great Lakes Studies, and United States. Environmental Protection Agency. Office of Research and Development (page images at HathiTrust)
Find more by P. K. Kovacic at your library, or elsewhere.