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| | Missouri Geophysical Selected References |
 | | Missouri Division of Geology and Land Survey, 1943, Magnetic map of Missouri: Missouri Division Geology and Land Survey, Geophysical Map, scale 1:500,000. |
 | | Missouri Division of Geology and Land Survey, 1961, Aeromagnetic contour map, total intensity, St Clair (N 1/2) quadrangle, Missouri: Missouri Division of Geology and Land Survey Map, scale 1:62,500. |
 | | Missouri Division of Geology and Land Survey, 1968, Aeromagnetic contour map, total intensity, Seneca (E 1/2) quadrangle, Missouri: Missouri Division of Geology and Land Survey Map, scale 1:62,500. |
| pubs.usgs.gov /ds/2005/128/mo_refs.htm (2830 words) |
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