| Title | Author |
|---|---|
| Ames Monument | WyomingHeritage.org |
| Ames Monument | |
| Anchor Dam | |
| Anchor Dam, History of | Annette Hein |
| Anderson, A.A. | John Clayton |
| Anna Miller Museum | |
| Antlers Hotel | |
| Arapaho tribe, arrival of on Shoshone Reservation, 1878 | WyoHistory.org |
| Archeology, alpine in Wyoming | Rebecca Hein |
| Arthur, Chester A. and 1883 trip to Yellowstone | Dick Blust, Jr. |