Albert Einstein at Mt. Wilson Observatory
Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA
Photograph collection - Einstein-- EB Series-barn collection\5-EB PHOTOS with A.E.-4-5 inch (2 of 4-dated)
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At the Mt. Wilson Observatory in California, (from l. to r.): Albert Einstein, his assistant, Walther Mayer, and astronomer Charles Edward St. John.