Earthen floor & wall tiles : a survey of the production and trade in earthen floor and wall tiles in the United States and in the principal producing countries, with special reference to factors essential to tariff considerations ; under the general provisions of section 332, title III, Part 2, Tariff Act of 1930
(1941)
Clay deposits of North Idaho
Hubbard, Charles R., (1956)
Wage structure: structural clay products, May 1954
Lewis, L. Earl, (1954)
