| #7991 | World list of future international meetings. Part 1, Science, technology, agriculture, medicine. -- Spojené státy americké : Washington : Library of Congress, 1959-1966 |
| #7992 | World meetings. Outside United States and Canada. -- Spojené státy americké : New York : Macmillan Information, 1987-1993. -- ISSN 0043-8693 |
| #7993 | World metal statistics. -- London : World Bureau of Metal Statistics, 1967-. -- ISSN 0043-8758 |
| #7994 | World non-ferrous metal statistics. -- Velká Británie : Birmingham : British Bureau of Non-Ferrous Metal Statistics, 1948-1967 |
| #7995 | World of metallurgy, Erzmetall. -- Clausthal-Zellerfeld : GDMB-Medienverlag, 2004-. -- ISSN 1613-2394 |
| #7996 | World of mining, surface, underground. -- Clausthal-Zellerfeld : GDMB-Medienverlag, 2004-. -- ISSN 1613-2408 |
| #7997 | World oil. -- Houston : Gulf, 1947-. -- ISSN 0043-8790 |
| #7998 | World petroleum report. -- Spojené státy americké : New York : Mona Palmer Publishing, 1954-1976. -- ISSN 0509-3171 |
| #7999 | World petroleum : the management publication of the international petroleum industry. -- Spojené státy americké : New York : M. Palmer, 1930-1972. -- ISSN 0043-8847 |
| #8000 | World Power Conference : Annual report ... -- Velká Británie : London : Central Office of the World Power Conference, 1934-1968 |