National Geographic Field Guide to the Birds of North America Sandia Scale 1:250

Scale 1:250

Authors:  David Ryan

but check with the ranger district first

This book details the ins and outs of running the river in maps and a mile by mile guide

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National Geographic Field Guide to the Birds of North America Sandia Scale 1:250Birding is the fastest growing wildlife related activity in the U. S., and even conservative estimates put the current number of U. S. birders at 50 million. According to the New York Times, some authorities predict that by 2050 there will be more than 100 millionand the National Geographic Field Guide to the Birds of North America will be the essential reference for field identification and the cornerstone of any birder's library. This is the