Nitrate and nitrite variation in ground water /

Cover title.

Probable evolution and morphological variation in South American Disonychine flea beetles (Coleoptera: chrysomelidae) and their amaranthaceous hosts /

Issued June 1979.

The chances of death, and other studies in evolution.

"Errata" slip tipped in at v. 1, p. [1]; Addenda slip tipped in at v. 2, p. [413]