Waterproofing. United States Government master specification for integral waterproofing material (for use with portland cement mortar or concrete), Federal Specifications Board Specification 444a, revised Mar. 5, 1928, officially promulgated by Federal Specifications Board, Oct. 28, 1926, for use of Departments and independent establishments of Government in purchase of integral waterproofing material (for use with portland cement mortar or concrete).

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