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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Erlenmeyer flasks full of liquid and wood samples. Forest Products laboratory, Madison, Wisconsin" The New York Public Library Digital Collections. 1937. https://old-digitalcollections.nypl.org/items/2c8c1c80-fb36-0136-622d-009d67b32359
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Erlenmeyer flasks full of liquid and wood samples. Forest Products laboratory, Madison, Wisconsin" New York Public Library Digital Collections. Accessed October 10, 2026. https://old-digitalcollections.nypl.org/items/2c8c1c80-fb36-0136-622d-009d67b32359
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1937). Erlenmeyer flasks full of liquid and wood samples. Forest Products laboratory, Madison, Wisconsin Retrieved from https://old-digitalcollections.nypl.org/items/2c8c1c80-fb36-0136-622d-009d67b32359
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(still image)
Erlenmeyer flasks full of liquid and wood samples. Forest Products laboratory, Madison, Wisconsin, (1937)|author=Digital Collections, The New York Public Library |accessdate=October 10, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>