Argentina 897-901

$ 1.65

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Argentina 897-901, MNH, $2.25. Michel 1025-1029. Portraits 1969. Pedro N. Arata, 1849-1922, chemist; Miguel Fernandez, 1883-1950, zoologist; Angel P. Gallardo, 1867-1934, biologist; Christobal Hicken, 1875-1933, botanist; Eduardo Ladislao Holmberg, 1852-1937, natural scientist