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A variety of specimens of steatite from the Red Pipestone Quarry, 1836.
[Notes on color from a lecture by Rudolph Schaeffer], 1926 Sept. 9.
[Notes on color from a lecture by Rudolph Schaeffer], 1926 Sept. 30.
[Glazebook #7], ca. 1939.
elab. of point that gets lost, between 1940 and 1970.