Median line map figures for 1910
name: label: Collection Collector
content: McCormick, Mack
setName: label: See more items in
content: Robert "Mack" McCormick Collection
label: See more items in
content: Robert "Mack" McCormick Collection / Series 4: Manuscripts and Writings / 4.12: Origin of Blues
unitdate: label: Date
content: undated
container: label: Container
content: Box 57, Folder 1
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials