Tectonic imbrication and foredeep development in the Penokean orogen, east-central Minnesota :
an interpretation based on regional geophysics and the results of test-drilling /
by D.L. Southwick and G.B. Morey. The Penokean orogeny in Minnesota and upper Michigan--a comparison of structural geology / by Timothy B. Holst.

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Full view   Technical Report Archive & Image Library
Full view   University of California
Full view   University of Illinois at Urbana-Champaign
Full view   no.1904CD 1991 The Ohio State University