Concrete
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References
[1] ASTM C 1492-01 Standard Specification for Concrete Roof Tiles
[2] Terry Kennedy; Roofing Instant Answers; McGraw-Hill. 2002
[3] Bo Johansson; Concrete Roofing Tiles; Building issues, Vol 4 1992
[1] ASTM C 1492-01 Standard Specification for Concrete Roof Tiles
[2] Terry Kennedy; Roofing Instant Answers; McGraw-Hill. 2002
[3] Bo Johansson; Concrete Roofing Tiles; Building issues, Vol 4 1992