| #511 | Rapid prototyping journal. -- Bingley : Emerald, 1995-. -- ISSN 1355-2546 print. -- ISSN 1758-7670 online |
| #512 | RD, research development. -- Barrington : Technical Publishing Company, 1960-1978. -- ISSN 0034-5199 |
| #513 | La Recherche. -- Paris : Société d'éditions scientifiques, 1970-. -- ISSN 0029-5671 print. -- ISSN 1625-9955 online |
| #514 | Repertorium der technischen, mathematischen und naturwissenschaftlichen Journal-Literatur. -- Německo -Germany : Repertorium der technischen, mathematischen und naturwissenschaftlichen Journal-Literatur Naklad.údaje Leipzig : Quan, 1869-1871 |
| #515 | Report of the Meeting of the British Association for the Advancement of Science. -- United Kingdom -Spojené království Velké Británie : London : J. Murray, 1884 |
| #516 | Report of the National Conference on Weights and Measures. -- Spojené státy americké - United States : Washington : U.S. Government Printing Office, 1928-1989 |
| #517 | Reports of Research Institute for Applied Mechanics. -- Fukuoka : Research Institute for Applied Mechanics, 1972-1998. -- ISSN 0023-6195 |
| #518 | Reports of the Faculty of Science Kagoshima University. -- Kagoshima : Kagoshima University, 1969-1996. -- ISSN 0385-4019 |
| #519 | Reports of the Institute of High Speed Mechanics, Tohoku University. Series B, Technology. -- Japonsko : Tohoku Daigaku Kenkyujo hokoku. Kogaku - Soku-Ken, 1951-1989. -- ISSN 0370-5315 |
| #520 | Reports of the Research Institute of Electrical Communication, Tohoku University. Series B, Technology. -- Japonsko : Sendai : Tohoku University, 1951-1975. -- ISSN 0563-6531 |