Subsurface maps of the lower Ordovician (Canadian series) of Missouri [cartographic material] / by Earl McCracken and Mary H. McCracken.
- Relief shown by contours. Contour interval 50 feet. Isopachous intervals differ. Title from cover of envelope. Maps by Earl McCracken, 1950-1959, revised to 1964 by Mary H. McCracken.
- Missouri Dept. of Business and Administration, Division of Geological Survey and Water Resources
- Held by
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