Federal supply schedule, FSC group. 56. Construction and building materials (formerly class 59), FSC class 5610, Mineral construction materials bulk, FSC class 5620, Building glass, tile, brick and block, FSC class 5640, Wallboard, building paper and thermal insulation materials, FSC class 5650, Roofing and siding materials, GSA region 3, District of Columbia, in Maryland, Virginia and West Virginia, Feb. 15-Aug. 14, 1958; prepared by GSA region 3.

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