| #221 | The Hazardous waste consultant. -- Lakewood : McCoy & Associates, 1983-. -- ISSN 0738-0232 print. -- ISSN 1878-3945 online |
| #222 | Heating & ventilating engineer and journal of air conditioning. -- London : Technitrade Journals, 1937-1976. -- ISSN 0017-937X |
| #223 | Herald of the Russian Academy of Sciences. -- Moscow : Nauka. -- ISSN 1019-3316 print. -- ISSN 1555-6492 online |
| #224 | Hexagon digest : item from the laboratories Hexagon house. -- Velká Británie : Manchester : Imperial Chemical Industries Ltd., Dyestuffs Division, 1948-1958, 1948-1958 |
| #225 | Hidraulica. -- Bucureşti : Institutul de Cercetări pentru Hidraulică şi Pneumatică, 1997-. -- ISSN 1453-7303 |
| #226 | Hightech : Trends - Märkte - Management. -- Německo : München : MP Management-Presse Verlag, 1986-1991. -- ISSN 0176-3474 |
| #227 | Highway Research Board : Publications. -- Spojené sáty americké : Washington : vl. n., 1974 |
| #228 | Hispanic engineer and information technology. -- Baltimore : Society of Hispanic Professional Engineers, 1994-. -- ISSN 1088-3452 |
| #229 | Hitsaustekniikka Svetsteknik. -- Finsko : Helsinki : Finlands Svetstekniska Förening, 1964-1969 |
| #230 | Hochfrequenztechnik und Elektroakustik. -- Německo : Leipzig : Akademische Verlagsgesellschaft Geest und Portig, 1932, 1932-1971. -- ISSN 0018-2958 |