"Koch Foundation- book expenses- family history invoices", 2006, 2010

"Koch Foundation- book expenses- family history invoices", 2006, 2010, Box: 41, Folder: 26. Robinson-Clapp family archives, RH MS 578. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/586651 Accessed January 23, 2026.