Trees & shrubs:
- Trees of Ontario by Linda Kershaw, 2001 (portable, good keys)
- Shrubs of Ontario by James H. Soper and Margaret Heimburger, Royal Ontario Museum, 1982
- Peterson Field Guide to Trees and Shrubs by George A. Petrides and Roger Tory Peterson, 1973
- Trees in Canada by John Laird Farrar, 1995
Wildflowers:
- The ROM Field guide to Wildflowers of Ontario by T. Dickinson, D. Metsger, J. Bull and R. Dickinson, 2004
- A Field Guide to Wildflowers by R.T. Peterson and Margaret McKenney, 1968
- Newcomb’s Wildflower Guide by Lawrence Newcomb, 1977
- The Orchids of Bruce and Grey by the Bruce-Grey Plant Committee, Owen Sound Field Naturalists, 1997 (available at TFN office)
- The Asters, Goldenrods and Fleabanes of Grey and Bruce Counties by Bruce Grey Plant Committee, Owen Sound Field Naturalists, 2000 (available at TFN office)
Mosses:
- A Graphic Guide to Ontario Mosses by Robert Muma, Toronto Field Naturalists, 1984
Ferns, horsetails and club mosses:
- Ferns of Northeastern and Central North America, 2nd edition by R. Cobb, 2005
- The Ferns of Grey and Bruce by Bruce-Grey Plant Committee, Owen Sound Field Naturalists, 1999 (available at TFN office)
Wetland plants:
- Wetland Plants Ontario by S.G. Newmaster, A.G. Harris, L.J. Kershaw, et al., 1997
Birds:
- Sibley Field Guide to Birds of Eastern North America by DA Sibley, 2002
- A Field Guide to the Birds (Revised Edition) by R.T. Peterson, 1999
- Birds of North America by C.S. Robbins et al, 1983
- National Geographic Field Guide to the Birds of North America, Fifth Edition by JL Dunn, 2006
Insects:
- Kaufman Field Guide to Insects of North America by Eric R. Eaton and Kenn Kaufman, 2007
- Butterflies through Binoculars: The East by J Glassberg, 1999
- Beginner’s Guide to Dragonflies by Nikula et al, 2002
- Field Guide to The Dragonflies and Damselflies of Algonquin Provincial Park by Colin D. Jones, Andrea Kingsley, Peter Burke and Matt Holder, 2008
Amphibians and reptiles
- Familiar Reptiles and Amphibians of Ontario by Bob Johnson, Natural Heritage/Natural History, 1989
Mammals:
- Mammals of North America, (4th edition) by Fiona Reid, 2006
Animal tracks, scats and other signs:
- A Field Guide to Animal Tracks, by Olaus J. Murie, 1975