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39. Fuller, W. B. : The Laws of Proportioning Concrete. Report to the 



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40. Gadd, W. L. : Composition of a Number of Proprietary Mixtures for 



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41. Gary and Schneider: Behavior of Hydraulic Cement in Sea Water. Mt. 



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43. Goldbeck, A. T. : Expansion and Contraction of Concrete While Harden- 



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44. Greenman, R. S. : Practical Tests of Sand and Gravel Proposed for Use 



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45. Grimsley, C. P.: The Gypsum of Michigan. Geol. Surv. Mich., 9, (2), 



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47. Heisee, A. : The Grinding Process and the Setting of Portland Cement. 



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48. Janda, F. : Theories of the Setting and Hardening of Portland and Roman 



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