Problems of development ...
Published: 1929
Place of publication: New York
Language: eng
Number of pages: 36
Notes: At head of title: Seventh Sedgwick memorial lecture.

Reprinted from the American naturalist for January-February, 1929, vol. 63, no. 684, p. 5-36. cf. p. [3].

"Literature cited": p. 34-36.