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20 Prairial
Leeuwenhoek's observations of duckweed and the freshwater microorganisms ('animalcules') attached to it
Inscribed below: 'Isaacus Newton Eq
Two figures showing portions of the human dura mater
Winter Work for the Cowboys mb-code 42-20036708 20 Prairial'Winter Work for the Cowboys', 1906 (1908 1909). From Penrose's Pictorial Annual 1908 1909, An Illustrated Review of the Graphic Arts, volume 14, edited by William Gamble and published by AW Penrose (London, 1908 1909).
