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2. ASTM (1999a) ASTM C 121-90-Standard test method for water absorption of slate, p 2
3. ASTM (1999b) ASTM C 217-94-Standard test method for weather resistance of slate, p 3
4. ASTM (2000a) ASTM C 406-00-Standard specification for roofing slate, p 2
5. ASTM (2000b) ASTM-C120-00-Standard test methods of flexure testing of slate. Modulus of rupture, modulus of elasticity, p 3