Paul Carpenter Standley (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Paul Carpenter Standley" in English language version.

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books.google.com

Standley, Paul Carpenter (1941). "FMNH Third Botanical Expedition to Guatemala, Notes". Field Museum Digital Collections. Retrieved April 14, 2020.

United States National Museum Division of Plants. "Records, 1902-1922". Smithsonian Institution Archives. Retrieved 15 May 2015.

Rose, Joseph Nelson (c. 1917). "Cacti, 1909 - 1917". transcription.si.edu. Retrieved 2020-01-06.