Sorley and Elder Mail is two letters sent between Lewis Sorley and Dan Elder in 2001 about George E. Loikow.

Wooldridge, Elder, and Egersdorfer Mail is a 2001 selection of correspondence between William Wooldridge, Rudolf Egersdorfer, and Dan Elder.

Wooldridge, Elder, and Gorman Mail is a selection of correspondence between William Wooldridge, Paul Gorman, and Dan Elder.

NCO Chronology is a document detailing the history of the Noncommissioned Officer beginning 1945 and ending in 1998.

2006 AMC CSM History is a document covering the history of the United States Army Materiel Command and Dan Elder.

Off the Record Comments is a document from the National Archives written by George W. Dunaway about William O. Wooldridge.

Skender and Elder Mail is a 2000 Stackpole Books letter sent by Edward Skender to Dan Elder about “Guardians of the Republic”.

Hendricks and Elder Mail is a 2001 Department of Defense letter written by Charles Hendricks to Dan Elder about his memorandum.

Birtle and Elder Mail is a 2002 Department of Defense letter sent by Andrew J. Bittle to Dan Elder about the Hall of Honor.