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: "Green\ River\ Watershed\ \(Wyo.\-Utah\)"

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Aven Nelson collecting field book 1897 : records nos. 3752-4481 (serial arrangement)
Aven Nelson collecting field book 1897 : records nos. 3752-4481 (systematic arrangement)
Aven Nelson collecting field book 1898 : records nos. 4297-5398
Aven Nelson collecting field book 1897 : records nos. 2875-2903
Aven Nelson collecting field book 1898 : records nos. 4297-5398 (systematic arrangement)
Aven Nelson collecting field book 1894-1895 : records nos. 1-1878 (serial arrangement)
Aven Nelson collecting field book 1894 : records nos. 509 to 1208.
Aven Nelson collecting field book 1898 : records nos. 4501-4841 (serial arrangement)