Choropleth map with graduated circles showing the number of employees in each county employed by mineral processing industries in 1967. Detached from: An atlas of Indiana / by Robert C. Kingsbury , with contributions from John M. Hollingsworth and others. Bloomington, Indiana : Department of Geography, Indiana University, [1970]. Page 52.
Imprint: [Bloomington, Indiana] : [Department of Geography, Indiana University], [1970]
Dimensions: 26 x 18 cm, on sheet 28 x 21 cm