The George Hubert Wilkins Collection contains a handwritten letter written to R. J. Blindell, owner of R. J. Blindell, Limited; the company that provided footwear to the Wilkins-Ellsworth Trans Arctic Submarine Expedition. The 1931 letter was written on R. J. Blindell, Limited stationary, and describes how helpful the Blindell footwear was to the expedition; it is signed "The North Pole Hikers." Also included is the mailing envelope for this letter, which was stamped with a Wilkins-Ellsworth Trans Arctic Submarine Expedition postal cachet.

The back side of the letter was reused by R. J. Blindell to write an additional letter on December 8, 1942; this letter is addressed to Edwin Garrett, and describes the stamp and postal cachet on the envelope from the original letter.