Fluorspar District of Illinois Historical Document Folder: Mississippian - Cave in Rock File: Memorandum.pdf UID: 380
Dates
Dataset Reference Date
2015-09-28
Info Date
1941-07-07
Summary
Historical Fluorspar District Document from Industrial Mineral Section Records Folder: Mississippian - Cave in Rock File: Memorandum.pdf Type: Correspondence Author: Workman, L. E. UID: 380
Summary
Historical Fluorspar District Document from Industrial Mineral Section Records Folder: Mississippian - Cave in Rock File: Memorandum.pdf Type: Correspondence Author: Workman, L. E. UID: 380