Wikimedia Commons/Related names: Carnegie Institution Forbes, S F Holmes, David
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Spalding and Blumer’s 1908 Saguaro Census on Tumamoc Hill
In 1908, two men set out to count every giant cactus on an Arizona hill.
Professor Volney Spalding and his assistant Jacob Blumer tagged and mapped up to 15,000 saguaros on Tumamoc Hill, creating the first real cactus census in history…