The system of animate nature; the Gifford lectures delivered in the University of St. Andrews in the years 1915 and 1916, by J. Arthur Thomson.

1

The system of animate nature; the Gifford lectures delivered in the University of St. Andrews in the years 1915 and 1916, by J. Arthur Thomson.

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Notes on snakes from Yucatan, by Karl P. Schmidt and E. Wyllys Andrews.

v.20:no.18(1936)

Notes on snakes from the Yucatan Peninsula, by E. Wyllys Andrews.

v.20:no.25(1937)