Books by David Gary Nielsen:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Nielsen, David Gary, 1943-: Insects on woody ornamentals : pests or non-pests? (Ohio Agricultural Research and Development Center, 1972), also by C. Philip Balderston and Ohio Agricultural Research and Development Center (page images at HathiTrust)
Find more by David Gary Nielsen at your library, or elsewhere.