40 21, Ball Mill, section showing grinding plates and sieves
name: label: Collection Creator
content: Missionary Catechists of Divine Providence.
label: Collection Creator
content: Massachusetts Institute of Technology (MIT) Civil Engineering Department
label: Collection Creator
content: Underwood and Underwood
setName: label: See more items in
content: Division of Work and Industry Lantern Slide Collection
label: See more items in
content: Division of Work and Industry Lantern Slide Collection / Series 1: Engineering / 1.14: Railroad Mileage Maps / 1.14.2: Concrete Structures, Techniques, and Production
unitdate: label: Date
content: undated
container: label: Container
content: Box 64, Item 20
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
label: Type
content: Photographs