| #7831 | World irrigation. -- Spojené státy americké : New Orleans : Peace, 1967-1970. -- ISSN 0043-8588 |
| #7832 | World list of future international meetings. Part 1, Science, technology, agriculture, medicine, Part 2, Social, commercial, cultural, humanistic. -- Spojené státy americké : Washington : Library of Congress, 1967-1969 |
| #7833 | World list of future international meetings. Part 1, Science, technology, agriculture, medicine. -- Spojené státy americké : Washington : Library of Congress, 1959-1966 |
| #7834 | World meetings. Outside United States and Canada. -- Spojené státy americké : New York : Macmillan Information, 1987-1993. -- ISSN 0043-8693 |
| #7835 | World metal statistics. -- London : World Bureau of Metal Statistics, 1967-. -- ISSN 0043-8758 |
| #7836 | World non-ferrous metal statistics. -- Velká Británie : Birmingham : British Bureau of Non-Ferrous Metal Statistics, 1948-1967 |
| #7837 | World of metallurgy, Erzmetall. -- Clausthal-Zellerfeld : GDMB-Medienverlag, 2004-. -- ISSN 1613-2394 |
| #7838 | World of mining, surface, underground. -- Clausthal-Zellerfeld : GDMB-Medienverlag, 2004-. -- ISSN 1613-2408 |
| #7839 | World oil. -- Houston : Gulf, 1947-. -- ISSN 0043-8790 |
| #7840 | World petroleum report. -- Spojené státy americké : New York : Mona Palmer Publishing, 1954-1976. -- ISSN 0509-3171 |