F. R. Gruger was an illustrator. He illustrated two magazine publications of works by Agatha Christie.
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- 1935, November 9 (Volume 208, Number 19) to December 14 (Volume 208, Number 24) of The Saturday Evening Post - Murder in Mesopotamia.
- 1937, October 23 (Volume 210, Number 17) of The Saturday Evening Post - The Dream.