Subject
- Railroads and state--Canada1
- Railroads and state--United States1
- Ratings and rankings1
- Recreation1
- Religious institutions1
- Reservoirs1
- Retail trade1
- Retail trade--Canada1
- Retail trade--United States1
- Rivers--Canada1
- Roads--America1
- Scenic byways1
- Schools1
- Seismology1
- Stream channelization1
- Swamps1
- Telephone1
- United States--Statistics1
- Urbanization1
- Volcanic eruptions1