vi, 22 pages : illustrations, maps (3 folded in pocket) ; 23 cm
OCLC
ocm00198274
Bibliography: pages 21-22.
Plate 1: Geologica map of parts of the Ironton and Fredericktown area Missouri -- Plate 2: Total intensity magnetic map of parts of the Ironton and Fredericktown area Missouri -- Plate 3: Second derivative magnetic map of the Ironton and Fredericktown area Missouri