| #6641 | Riken review : light science and technology. -- Saitama : The Institute of Physical and Chemical Research (RIKEN), 1993-. -- ISSN 0919-3405 |
| #6642 | Rivista dei combustibili. -- Milano : Tamburini, 1947-2001. -- ISSN 0370-5463 |
| #6643 | La Rivista dei combustibili e dell'industria chimica. -- Milano : Arti grafiche S. Pinelli, 2002-. -- ISSN 1972-0122 |
| #6644 | Rivista del Nuovo Cimento. Serie 2. -- Itálie - Italy : Bologna : Editrice Compositori, 1973-1974 |
| #6645 | Rivista del Nuovo Cimento. Serie 1. -- Itálie - Italy : Bologna : Editrice Compositori, 1969-1970 |
| #6646 | Rivista RIV. -- Itálie - Italy : Torino : RIV, 1953-1965 |
| #6647 | Road abstracts. -- United Kingdom -Spojené království Velké Británie : London : H.M.Stationery Office / 1966-1968Crowthorne : Technical Information and Library Group, 1934-1968. -- ISSN 0370-6567 |
| #6648 | Road International. -- Schweiz : Geneva : International Road Federation, 1963- |
| #6649 | Road Tar. -- United Kingdom -Spojené království Velké Británie : London : British Tar Industry Association, 1947-1970. -- ISSN 0035-7251 |
| #6650 | Road tar & allied binders. -- United Kingdom -Spojené království Velké Británie : London : British Tar Industry Association, 1970, 1970-1979 |