Three Notch Survey Mark

1938

Medium: watercolor and graphite on paper
Dimensions: overall: 50.8 x 35.5 cm (20 x 14 in.) Original IAD Object: 16 5/8" long; 3 1/4" wide; 1" thick
Museum: National Gallery of Art, Washington, DC, US

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United States Geological Survey, 1936

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