A strange arthropod from the Mazon Creek of Illinois and the Trans Permo-Triassic Merostomoidea (Trilobitoidea) / [by] Frederick R. Schram --

v.20:no.6(1971)

Seasonal status, relative abundance, and behavior of the birds of Concepción, Departamento Santa Cruz, Bolivia / Susan E. Davis.

n.s. no.71(1993)