Preus Robert D. Preus(英语:Robert Preus) Rolf Preus Earl D. Radmacher RobertG. Rayburn(英语:RobertG. Rayburn) K. Reddy Robert L. Reymond(英语:Robert L. Reymond)
Breen,第238頁. Bureau of the Mint,第44–45頁. Lange,第98–99頁. Bureau of the Mint,第48頁. Rayburn,第42頁. Peters & Mohon 1995,第16頁. Bowers,第54頁. Vermeule,第60頁. Vermeule,第60