Talk:Carl Theodore Heisel

Latest comment: 5 years ago by Wikiman2718

Anyone interested in expanding this article may want to start with these sources.

  • Simanek, Donald E. "Carl Theodore Heisel Squares the Circle". lockhaven.edu. Retrieved 23 May 2019.
  • "Results for Carl Theodore Heisel on Newspapers.com". Newspapers.com. Retrieved 6 July 2019.

``Wikiman2718 (talk) 02:18, 5 August 2019 (UTC)Reply