Geology and Ore Deposits of the Eureka and Adjoining Districts, San Juan Mountains, Colorado

Arsenic as an Indicator Element for Mineralized Volcanic Pipes in the Red Mountains Area, Western San Juan Mountains, Colorado: Issues 1361-1364

Principles of Formation of Chimney-like Vents in Shallow Volcanic Environments

Geology and Ore Deposits of the Bonanza Mining District, Colorado

The Copper Deposits of Michigan

Manganese Deposits of the Republic of Haiti: Issues 952-953

Ground-water Conditions in the Soil and Moisture Conservation Demonstration Area Near Torrington, Goshen County, Wyoming: Issues 236-246