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<p>At head of title: Bulletin of Iowa State College of Agriculture and Mechanic Arts, vol. XII, Dec. 1, 1913, no. 20
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<br>Subjects: Concrete; Gravel</div>
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<dl><dd>Agg, Thomas Radford, 1878-</dd>
<dd>Nichols, Charles Sabin, 1883- joint author</dd></dl></div>
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