- EbookGrand Teton [Wyoming] National ParkUnited States. Department of the Interior
- EbookMesa Verde [Colorado] National ParkUnited States. Department of the Interior
- EbookThe Nation's RiverUnited States. Department of the Interior
- EbookThe Nation's RiverUnited States. Department of the Interior
- EbookGrand Teton [Wyoming] National ParkUnited States. Department of the Interior
- EbookMesa Verde [Colorado] National ParkUnited States. Department of the Interior
- EbookSequoia [California] National ParkUnited States. Department of the Interior
- EbookSequoia [California] National ParkUnited States. Department of the Interior