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GMC 15 ASTM D226-05 Type 1, GMC 30 ASTM ASTM D226-05 Type II
“Authentic†Asphalt Saturated Organic Felt
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GMC 18" 30 ASTM D 226-05, GMC 22" 30 ASTM D 226-05
“Authentic†Asphalt Saturated Organic Felt
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