Roofing Granules in Viles - Rock Granules

This artifact collection is an assortment of fifteen different colored rock granules contained in glass viles. Donor's Remarks:  These roofing samples are courtest of Mr. Robert E. Spencer, PHR 3M Industrial Mineral Products Divition - P. O. Box 1328 - Corona, CA - 91718 - 909.737.9441.
Abstract/Description: This artifact collection is an assortment of fifteen different colored rock granules contained in glass viles. Donor's Remarks: These roofing samples are courtest of Mr. Robert E. Spencer, PHR 3M Industrial Mineral Products Divition - P. O. Box 1328 - Corona, CA - 91718 - 909.737.9441.
Subject(s): MINES AND MINING
Corona, CA