"Ingraham and Clapp research needed in U.K., John Langdon, Devon, see G. Swinfield 2009", 2008 - 2010

"Ingraham and Clapp research needed in U.K., John Langdon, Devon, see G. Swinfield 2009", 2008 - 2010, Box: 31, Folder: 27. Robinson-Clapp family archives, RH MS 578. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/581618 Accessed January 23, 2026.