A Field Guide to the Birds, giving field marks of all species found in eastern North America by Roger Tory Peterson, 1934
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Sketching
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Field Marks
![](https://4.bp.blogspot.com/-FuLnhsFnPQ8/TWSD6Se4mKI/AAAAAAAAAHQ/TTF-cW0BCEI/s320/osprey.jpeg)
Taking notes on an osprey
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A Field Guide to the Birds, giving field marks of all species found in eastern North America by Roger Tory Peterson, 1934