| #391 | Mobile communications international. -- London : Cheerman, 1993-. -- ISSN 1352-9226 |
| #392 | Mobile electronics retailer. -- Redondo Beach : Bobit Pub. Co. -- ISSN 1522-0656 |
| #393 | Mobile matters. -- Coventry : M2 Communications, 1995-. -- ISSN 1363-9927 |
| #394 | Mobile phone news. -- Bethesda : Phillips Pub., 1983-. -- ISSN 0737-5077 |
| #395 | MPA Messen prüfen automatisieren : Komponenten und Systeme für die Elektro- und Automatisierungstechnik. -- Kaufering : b-Quadrat Verlags, 1993-. -- ISSN 0945-7143 |
| #396 | Nachrichtentechnik, Elektronik. -- Berlin : Verlag Technik, 1973-1995. -- ISSN 0323-4657 |
| #397 | Nano letters. -- Washington : American Chemical Society, 2001-. -- ISSN 1530-6984 print. -- ISSN 1530-6992 online |
| #398 | NASA tech briefs : official publication of the National Aeronautics and Space Administration. -- New York : Associated Business Publications, 1976-. -- ISSN 0145-319X |
| #399 | Nature nanotechnology. -- London : Nature publishing group, 2006-. -- ISSN 1748-3387 print. -- ISSN 1748-3395 online |
| #400 | NEC research & development. -- Tokyo : NEC Creative, 1960-2003. -- ISSN 0547-051X |