A. Geology and mineral paragenesis of the Pea Ridge Iron Ore Mine, Washington County, Missouri : origin of the rare-earth-element- and goldbearing breccia pipes /

Includes bibliographical references.

Guide leaflet, geological science field trip, Monmouth area, Warren County : Monmouth and Alexis quadrangles /

"Revised January 1964"--P. 10.

Estimates of long-term suspended-sediment loads in Bay Creek at Nebo, Pike County, Illinois, 1940-80 /

Bibliography: p. 6.