The following analyses were made several years ago for Mr. E. P. Boynton, the city engineer of Cedar Rapids. The clays were taken from four companies in Des Moines; each having their plant in a different part of that city.
Proceedings of the Iowa Academy of Sciences
©1901 Iowa Academy of Science, Inc.
Bates, C. O.
"Analyses of Certain Clays Used for Making Paving Brick for Cedar Rapids,"
Proceedings of the Iowa Academy of Science, 9(1), 61-63.
Available at: https://scholarworks.uni.edu/pias/vol9/iss1/10