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Ejnar Hertzsprung grad student 1938 Københavns Universitet
 (Photographic Measurements of the Six Double Stars η Cassiopeiae, γ Virginis, ξ Bootis, 44i Bootis, σ Coronae Borealis, 70 Ophiuchi: And the Computation of Their Orbits with Special Attention to These Measurements.)
Peter van de Kamp post-doc 1938-1942 Swarthmore