Glass Strata and  Mirror Strata
name: label: Collection Creator
content: Holt, Nancy, 1938-2014
setName: label: See more items in
content: Nancy Holt Estate records
label: See more items in
content: Nancy Holt Estate records / Series 9: Photographic Material / 9.4: Robert Smithson Material
unitdate: label: Date
content: 1967
container: label: Container
content: Box 81, Folder 35
dataSource: label: Archival Repository
content: Archives of American Art
objectType: label: Type
content: Archival materials