Pennsylvanian invertebrates of the Mazon Creek area, Illinois / Eugene S. Richardson, Jr. --

v.12:no.4(1956)

Pennsylvanian invertebrates of the Mazon Creek area, Illinois / Eugene S. Richardson, Jr. --

v.12:no.1(1956)

Pennsylvanian invertebrates of the Mazon Creek area, Illinois: the Essex fauna and medusae / Ralph Gordon Johnson -- and Eugene S. Richardson, Jr. --

v.12:no.7(1968)

Pennsylvanian invertebrates of the Mazon Creek area, Illinois / Eugene S. Richardson, Jr. --

v.12:no.3(1956)

Caves of the Reserve area [by] Paul S. Martin, Chief Curator, Department of Anthropology, John B. Rinaldo -- [and] Elaine Bluhm --.

v.42(1954)

The salamanders of the Chicago area / by Karl P. Schmidt, Asst. Curator of Reptiles and Amphibians.

no.12(1930)

Geology and mammalian paleontology of the New Fork-Big Sandy area, Sublette County, Wyoming / [by] Robert M. West --. [Patricia M. Williams, -- editor --]

v.29(1973)

Endangered Species Act biennial report, status of recovery program / prepared by U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Office of Protected Resources.

1994-1996