FOREIGN DEVELOPMENTS 1969.1970; DOC. INVEST. GEOL. GEOTEC., ESC. TEC. SUPER. ING. MIN., ESP; ESP; 1970(8), VOL. 54, NUM. 0008, P. 1339 A 1597Miscellaneous

NORTH AMERICAN DEVELOPMENTS,1968.1969; AMER. ASS. PETROLEUM GEOLOGISTS BULL.; USA; 1969(6), VOL. 53, NUM. 0006, P. 1151 A 1328Miscellaneous

NORTH AMERICAN DEVELOPMENTS 1969.1970; AMER. ASS. PETROLEUM GEOLOGISTS BULL.; USA; 1970(6), VOL. 54, NUM. 0006, P. 887 A 1083Miscellaneous

DEVELOPMENTS IN FOREIGN FIELDS.1969; AMER. ASS. PETROLEUM GEOLOGISTS BULL.; USA; 1969(8), VOL. 53, NUM. 0008, P. 1561 A 1820Miscellaneous

EVAPORITES AND PETROLEUM.1969; AMER. ASS. PETROLEUM GEOLOGISTS BULL.; USA; 1969(4), VOL. 53, NUM. 0004, P. 773 A 1011Miscellaneous

MEMBERSHIP SUPPLEMENT.1969; AMER. ASS. PETROLEUM GEOLOGISTS BULL.; USA; 1969(10), VOL. 53, NUM. 0010-002 , P. 1 A 320Miscellaneous