Papers and charts on frequency ranges and principle zones of energy
name: label: Collection Creator
content: Kopp, Harriet Green, 1917-
setName: label: See more items in
content: Harriet Green Kopp Papers
label: See more items in
content: Harriet Green Kopp Papers / Series 1: Documents
unitdate: label: Date
content: February 1948
container: label: Container
content: Box 3, Folder 27
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
label: Type
content: Text