Unknown, V.M. Slipher and C.O. Lampland at the 24-inch Clark Telescope at Lowell Observatory, 1940 ca.
C.O. Lampland and V.M. Slipher demonstrate use of the 24-inch Clark Telescope at Lowell Observatory
Tags: Clark Telescope, Lampland C.O., Lowell Observatory, Slipher V.M.
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