Hybridity in animals and plants, considered in reference to the question of the unity of the human species /
Morton, Samuel George,1799-1851.
New Haven, Conn. : Printed by B. L. Hamlen, printer to Yale College,
1847.
Bound after this pamphlet are two further items extracted from other publications and bearing the running title: Morton's notes on hybridity.
Hybridization.