Freshwater Wilderness: Yellowstone Fishes & Their World by John D. Varley; Paul Schullery (Very good, 1983, Pbk, 133 pgs, The Yellowstone Library)

Cover has some wear; inside appears to be unmarked. ISBN 06877849

Freshwater Wilderness: Yellowstone Fishes & Their World published by the Yellowstone Library and Museum Association) is a field guide and natural history volume about the freshwater ecosystems of Yellowstone National Park.  It describes all of the park's fish species (native and non-native) with full-color plates and illustrations, provides an overview of Yellowstone's rivers and lakes, and weaves in the history of fishing, fish stocking, and management in the park, including early hatchery operations and the ecological effects of introducing non-native species.