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Letter from V.M. Slipher to Roger Putnam mentioning that Clyde Tombaugh has found an interesting object on the 13-inch telescope plates
V.M. Slipher, Letter from V.M. Slipher to Roger Putnam mentioning that Clyde Tombaugh has found an interesting object on the 13-inch telescope plates. Arizona Memory Project, accessed 18/02/2025, https://azmemory.azlibrary.gov/nodes/view/76024