Concrete beam testing, photograph with markings nine and eighteen
name: label: Collection Creator
content: Cummings, Robert A., 1866-1962
setName: label: See more items in
content: Cummings Structural Concrete Company Records
label: See more items in
content: Cummings Structural Concrete Company Records / Series 8: Lantern Slides
unitdate: label: Date
content: undated
container: label: Container
content: Box 35
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
label: Type
content: Graphic Materials