Ludlow Griscom

Griscom (right) with [[FDR]], May 1942 Ludlow Griscom (June 17, 1890 – May 28, 1959) was an American ornithologist known as a pioneer in field ornithology. His emphasis on the identification of free-flying birds by field marks became widely adopted by professionals and amateurs. Many called him "Dean of the Birdwatchers." Provided by Wikipedia
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by Griscom, Ludlow, 1890-1959.
Published 1945