Rudolph Minkowski (right front) and Ira Sprague Bowen inspecting pair of duplicate positive prints of sky survey atlas; James McClanahan (left) and Hendrik Rubingh sorting finished copies of atlas, Palomar Observatory. Minkowski and Bowen are at one end of a long wooden table; McClanahan and Rubingh are standing in front of the files. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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