The Geological and Natural History Survey of Minnesota
quarrymen and builders [relating to the collection of two-inch cubes
of building stones for physical tests of strength, and for chemical
examination, and samples of clay and brick for the General
3 p. This series includes circulars and announcements that were designed to inform the public
in the Survey’s early days of its plans, activities, and needs. Few copies of each
Circular 5. Building stones, lime, clay, etc..
The Geological and Natural History Survey of Minnesota.
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