Association RDF
pages:- Puerto Rico Microbiology Society
- Puerto Rico Pest Control Association
- Puerto Rico Science Teachers' Association
- Puerto Rico Teaching English to Speakers of Other Languages (TESOL)
- Puerto Rico Water Resources Association
- Purdue Alumni Association
- Real Estates Associations
- Refining Committee of Chemical and Petroleum Industries Division of the ISA
- Researchers Students Association
- Rethinking Schools
- Richard Bay Clean Air Association
- Ride a Bike, UPRM
- Riverwest Investment Cooperative, Milwaukee
- RUM's Professors Association (APRUM)
- RUMEGA Recinto Universitario de Mayagez English Graduate Association
- SA Environmental Observing Network
- SA Society for Atmospheric Sciences (SASAS)
- SCS
- Seismological Society of America (SSA)
- Sigma Pi Sigma
- Sigma Xi
- Sigma Xi Scientific Research Society
- Sociedad Espanola de Aracnologia
- Sociedad Estudios Espeleológicos del Norte, Inc.
- Society for American Archaeology
- Society for Environmental Journalists
- Society for Imaging Science and Technology
- Society for Industrial and Applied Mathematics (SIAM)
- Society for Industrial and Applied Mathematics.
- Society for Industrial Microbiology