1. Structural geology of parautochthonous and allochthonous terranes of the Penokean orogeny in Upper Michigan : comparisons with northern Appalachian tectonics Author/Creator: Gregg, William J., author Publication/Creation: [Reston, Va.] : U.S. Department of the Interior, U.S. Geological Survey, 1993 Resource Type: Book Access & Availability: Loading
2. Structural geology of parautochthonous and allochthonous terranes of the Penokean orogeny in Upper Michigan : comparisons with northern Appalachian tectonics Author/Creator: Gregg, William J., author Publication/Creation: Washington : U.S. G.P.O. ; Denver, CO : For sale by USGS Map Distribution, 1993 Resource Type: Book Access & Availability: Loading