A Guide to Common Freshwater Invertebrates of North America
Newcomb's Wildflower Guide
Birds of Pennsylvania Field Guide, Second Edition
Freshwater Ecology, Second Edition: Concepts and Environmental Applications of Limnology (Aquatic Ecology)
Trees of Pennsylvania Field Guide (Tree Identification Guides)
Fish of Pennsylvania Field Guide (Fish Identification Guides)
A Great Lakes Wetland Flora: A complete guide to the wetland and aquatic plants of the midwest (Bogman Guides)
PENN PLAX Standard Airline Tubing Air Pump Accessories, 25-Feet
Freshwater Macroinvertebrates of Northeastern North America