| A. Y. McDonald Manufacturing | Waterloo | IA |
| A. Y. McDonald Manufacturing | Dubuque | IA |
| Ballsford Station | Des Moines | IA |
| Bankers Life Building Addition | Des Moines | IA |
| Barnes Electric Light & Power | Maquoketa | IA |
| Basic Science Building | Iowa City | IA |
| Baxter Motor Company Dealership | Cedar Rapids | IA |
| Beaver Channel Power Plant | Clinton | IA |
| Beck & Wagner | Danville | IA |
| Bennett High School | Bennett | IA |
| Berkley & Company | Spirit Lake | IA |
| Berwanger Boiler | Dubuque | IA |
| Bestwall Gypsum | Fort Dodge | IA |
| Bethesda Hospital | Fort Dodge | IA |
| Bettendorf Community School | Bettendorf | IA |
| Bettendorf High School | Bettendorf | IA |
| Bettendorf Power Plant | Riverside | IA |
| Bishop Manufacturing | Clarinda | IA |
| Bixby W H | Des Moines | IA |
| Bixby W H | Davenport | IA |
| Blackhawk Foundry | Davenport | IA |
| Board Of Control Of State Institutions | Independence | IA |
| Board Of Control Of State Institutions | Des Moines | IA |
| Borden Chemical | Waterloo | IA |
| Bowlium/Tropic Lanes | Cedar Rapids | IA |
| Bowl-Mor Alleys | Sioux City | IA |
| Brammer Manufacturing | Davenport | IA |
| Brice Gas & Electric | Mason City | IA |
| Bridgestone | Des Moines | IA |
| Brittain & Company | Marshalltown | IA |
| Britt United Methodist Church | Britt | IA |
| Brown Derby Restaurant | Carroll | IA |
| Brown Lumber | Raymond | IA |
| Brunswick-Balke-Collender | Dubuque | IA |
| Builders Materials | Cedar Rapids | IA |
| Burlington High School | Burlington | IA |
| Burlington Northern & Santa Fe Railroad | Clinton | IA |
| Burlington Northern & Santa Fe Railroad | Burlington | IA |
| Burlington Ordnance Works | Burlington | IA |
| Burlington Power Plant | Burlington | IA |
| Burpee Seed | Clinton | IA |
| California Chemical | Fort Madison | IA |
| Camanche Elementary School | Camanche | IA |
| Canfield Hotel | Dubuque | IA |
| Can-Tex Industries | Ottumwa | IA |
| Can-Tex Industries | Des Moines | IA |
| Can-Tex Industries | Redfield | IA |
| Capital City Bank Building | Des Moines | IA |
| Capitol Square | Des Moines | IA |
| Caradco | Dubuque | IA |
