| A | B | C | D | E | F | G | H | I | J | K | L | M |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| • | R020 | |
| • | REAL ACADEMIA ESPANOLA | |
| • | RECOLECTA | |
| • | RECOMENDACIONES DE LAS NACIONES UNIDAS PARA EL TRANSPORTE DE MERCANCIAS PELIGROSAS, REGLAMENTACION MODELO | |
| • | RED DE INCUBADORAS | |
| • | RED DE REPOSITORIOS LATINOAMERICANOS | |
| • | REDALYC - RED DE REVISTAS CIENTIFICAS DE AMERICA LATINA Y EL CARIBE, ESPANA Y PORTUGAL | |
| • | REDIAL-TESIS | |
| • | REFDOC | |
| • | RENABI.AR - RED NACIONAL DE ASOCIACIONES DE BIBLIOTECARIOS DE LA REPUBLICA ARGENTINA | |
| • | RESEARCHGATE | |
| • | RESOURCES FOR LIBRARIANS AND ARCHIVISTS - LIBRARY OF CONGRESS | |
| • | RETEI - RED IBEROAMERICANA DE INCUBADORAS DE EMPRESAS DE BASE TECNOLOGICA | |
| • | REVISTA ESPANOLA DE DOCUMENTACION CIENTIFICA | |
| • | ROAD - DIRECTORY OF OPEN ACCESS SCHOLARLY RESOURCES | |
| • | ROGET'S THESAURUS | |
| • | RPTD - RED PERUANA DE TESIS DIGITALES | |
| • | RSC - ROYAL SOCIETY OF CHEMISTRY | |
| A | B | C | D | E | F | G | H | I | J | K | L | M |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |