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BS 680-1 44th Edition, December 18, 1944
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Roofing Slates Part 1: Imperial Units
Includes all amendments and changes through Amendment 1, April 21, 1971
Additional Comments: W/D NO S/S
Page Count:11
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Slates from the Cambrian, Ordovician, Silurian, Devonian, Dalradian formations. Characteristics, standard designations, thickness gradings, marketing descriptions, testing procedure for atmospheric conditions. Length and widths, with notes on randoms and peggies appended.