- E-bookGrand Teton [Wyoming] National ParkUnited States. Department of the Interior
- E-bookMesa Verde [Colorado] National ParkUnited States. Department of the Interior
- E-bookThe Nation's RiverUnited States. Department of the Interior
- E-bookThe Nation's RiverUnited States. Department of the Interior
- E-bookGrand Teton [Wyoming] National ParkUnited States. Department of the Interior
- E-bookMesa Verde [Colorado] National ParkUnited States. Department of the Interior
- E-bookSequoia [California] National ParkUnited States. Department of the Interior
- E-bookSequoia [California] National ParkUnited States. Department of the Interior