Willem J. Luyten, photographer
Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA
Photograph collection - Einstein-- EB Series-barn collection\11-EB PHOTOS with A.E.-6-7 inch (2 of 2-undated)
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Albert Einstein at the Leiden (Netherlands) home of physicist and mathematician Paul Ehrenfest, with Ehrenfest's son, Pavlik (Paul), sitting on Einstein's lap.