| Title | Article Type | Author |
|---|---|---|
| Yellowstone Fires,1988 | Encyclopedia | Dan Whipple |
| Yellowstone Forest Reserve | Encyclopedia | John Clayton |
| Yellowstone National Park | Field Trip | |
| Yellowstone National Park, history of | Encyclopedia | Tamsen Emerson Hert |
| Yellowstone National Park, President Chester A. Arthur trip to, 1883 | Encyclopedia | Dick Blust, Jr. |
| Yellowstone National Park, trails of | Encyclopedia | Robert G. and Elizabeth L. Rosenberg |
| Young, Clabe, 1880s rustler | Encyclopedia | Tom Rea |