TY - BOOK AU - Abraham,Herbert TI - Asphalts and allied substances : : Their occurrence, modes of production, uses in the arts and methods of testing PY - 1948/// CY - Toronto : PB - Van Nostrand, KW - ASFALTO KW - PETROLEO KW - PAVIMENTOS N1 - Tomo I: Raw materials and manufactured products;Tomo II: Methods of testing: Bibliography and references ER -