| #231 | Marine biology research. -- Abingdon : Taylor & Francis, 2005-. -- ISSN 1745-1000 print. -- ISSN 1745-1019 online |
| #232 | Marine geodesy : an international journal of ocean surveys, mapping and sensing. -- New York : Taylor & Francis, 1977-. -- ISSN 0149-0419 print. -- ISSN 1521-060X online |
| #233 | Marine georesources & geotechnology. -- New York : Taylor & Francis, 1993-. -- ISSN 1064-119X print. -- ISSN 1521-0618 online |
| #234 | Measurement techniques. -- New York : Consultants Bureau, 1958-. -- ISSN 0543-1972 print. -- ISSN 1573-8906 online |
| #235 | Mercator's world. -- Eugene : Aster Pub., 1996-2001. -- ISSN 1086-6728 |
| #236 | Meteorology and atmospheric physics. -- Wien : Springer, 1986-. -- ISSN 0177-7971 print. -- ISSN 1436-5065 online |
| #237 | Migracijske i etničke teme. -- Zagreb : Institut za migracije i narodnosti, 2001-. -- ISSN 1333-2546 |
| #238 | Mitteilungen der Österreichischen geographischen Gesellschaft. -- Wien : Österr. geographische Gesellschaft, 1959-. -- ISSN 0029-9138 |
| #239 | Monthly notices of the Royal Astronomical Society. -- Oxford : Blackwell, 1833-. -- ISSN 0035-8711 print. -- ISSN 1365-2966 online |
| #240 | Moravian Geographical Reports. -- Brno : Institute of Geonics, Czech Academy of Sciences, 1993-. -- ISSN 1210-8812 |