Pennsylvanian invertebrates of the Mazon Creek area, Illinois : Eurypterida / Kjellesvig-Waering, Erik N. Chicago Natural History Museum. text [Chicago] : Chicago Natural History Museum Press , 1963. eng p. 85-106 : 24 cm. "September 17, 1963." Includes bibliographical references (p. 104-106). Fieldiana series has been published as Geological Series by Field Columbian Museum (1895-1909) and Field Museum of Natural History (1909-1943), and as Fieldiana: Geology by Chicago Natural History Museum (1945-1966) and Field Museum of Natural History (1966-). Eurypterida. Paleontology -- Pennsylvanian. Paleontology -- Illinois.