. Contributions to the Pre-Cambrian Geology of Northern Michigan and Wisconsin: The Geology of Limestone Mountain and Sherman Hill in Houghton County, Michigan / E. C. Case and W. I. Robinson .
Contributions to the Pre-Cambrian Geology of Northern Michigan and Wisconsin: R.C. Allen and L. P. Barrett. the Geology of Limestone Mountain and . Michigan. E. C. Case and W. I. Robinson .