| Field Trips | |
| 1949, Blizzard of | Encyclopedia | Rebecca Hein |
| A.M.E. Church, Rock Springs | Encyclopedia | Brigida R. (Brie) Blasi |
| Ada Magill Grave | Encyclopedia | WyoHistory.org |
| Ada Magill Grave | Field Trips | |
| Afghan Project, University of Wyoming | Encyclopedia | WyoHistory.org |
| African-American women voters, early Wyoming elections | Encyclopedia | Wyoming State Archives |
| Airmail, U.S. in Wyoming | Encyclopedia | Steve Wolff |
| Aladdin Coal Tipple | Field Trips | |
| Aladdin General Store | Field Trips | |
| Albany County courthouse | Field Trips | |
| Albany County Public Library | Field Trips | |
| Albany County, Wyoming | Encyclopedia | Marguerite Herman |
| Albert, Prince of Monaco, hunts with Buffalo Bill, 1913 | Encyclopedia | John Clayton |
| Alcova Dam and Reservoir | Encyclopedia | Annette Hein |
| Alcova Lake | Field Trips | |
| Alfred Corum Grave | Field Trips | |
| All American Indian Days | Encyclopedia | Gregory Nickerson |
| Allred, Golden, Bighorn Basin trapper | Oral Histories | Washakie Museum and Cultural Center |
| Alvah Unthank Grave | Field Trips | |
| Amelia Earhart monument | Field Trips | |
| American Heritage Center | Field Trips | |
| American Indian geography in Wyoming | Encyclopedia | Gregory Nickerson |
| American Indian tribes, trade among | Encyclopedia | Samuel Western |
| Ames Monument | Field Trips | |
| Ames Monument | Encyclopedia | WyomingHeritage.org |
| Anchor Dam | Field Trips | |
| Anchor Dam, History of | Encyclopedia | Annette Hein |
| Anderson, A.A. | Encyclopedia | John Clayton |
| Anna Miller Museum | Field Trips | |
| Antlers Hotel | Field Trips | |
| Arapaho tribe, arrival of on Shoshone Reservation, 1878 | Encyclopedia | WyoHistory.org |
| Archeology, alpine in Wyoming | Encyclopedia | Rebecca Hein |
| Arnold Family Home | Field Trips | |
| Arnold, Thurman, Laramie lawyer and New Deal trustbuster | Encyclopedia | Dee Pridgen |
| Arthur, Chester A. and 1883 trip to Yellowstone | Encyclopedia | Dick Blust, Jr. |
| Astorian Expedition informative sign | Field Trips | |
| Atlantic City, Wyo. | Field Trips | |
| Atlantic City, Wyo. | Encyclopedia | Lori Van Pelt |
| Atlas Theatre | Field Trips | |
| Automobile, Wyoming’s first | Encyclopedia | Phil Roberts |
| Averell, Jim, newspaper reporting of the lynching of | Encyclopedia | Tom Rea |
| Ayres Natural Bridge | Field Trips | |
| Ayres Natural Bridge, Oregon Trail site | Encyclopedia | WyoHistory.org |
| Babcock, Charlotte, Casper author | Oral Histories | Nichole Simoneaux |
| Baker, Jim. Frontier Scout | Encyclopedia | Lori Van Pelt |
| Baker, Pvt. Ralston, pioneer grave of | Encyclopedia | Randy Brown |
| Balangiga, bells of | Encyclopedia | Douglas R. Cubbison |
| Banditti of the Plains, The | Encyclopedia | Rebecca Hein |
| Bank Robbery, Green River | Encyclopedia | Brigida R. (Brie) Blasi |
