Raamatud Ralph E. Grim
Illinois Clays and Shales As a Mortar Mix
Ralph K. Hursh, John Everts Lamar, Ralph E. Grim
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The Mica in Argillaceous Sediments American Mineralogist, V22, No. 7
Ralph E. Grim, Roger Hammond Bray, William Frank Bradley
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The Bonding Action of Clays, Part 1-2 Clays in Green Molding Sands and Clays in Dry Molding Sands
Ralph E. Grim, Frederick Leicester Cuthbert
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