An illustrated flora of the northern united states, canada and the british possessions: Vol. III /

by Britton, Nathaniel Lord
Published 1947

Our conception of "Species" as modified by the doctrine of evolution /

by Britton, Nathaniel Lord 1859-1934
Published 1894

The cactaceae : descriptions and illustrations of plants of the cactus family /

by Britton, Nathaniel Lord 1859-1934
Published 1919

Orchidàceae lindl. /

by Britton, Nathaniel Lord 1859-1934
Published 1920

The cactaceae : descriptions and illustrations of plants of the cactus family /

by Britton, Nathaniel Lord 1859-1934
Published 1963