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Rearing and Breeding Ponds at Cold Spring Harbor, showing Sunshades and Spawning Races for Large Ponds. By courtesy of Mr. W. H. Cooper, President of the Photo-Section, Brooklyn Institute.
Rearing and Breeding Ponds at Cold Spring Harbor, showing Sunshades and Spawning Races for Large Ponds. By courtesy of Mr. W. H. Cooper, President of the Photo-Section, Brooklyn Institute.