Description: Letter from Igor I. Sikorsky to Major William D. Phillips congratulating the U.S. Army Primary Helicopter Center on its 11th anniversary. In a post-script, he mentions that he has enclosed a photograph with the letter. On the back of the letter is a stamp giving the Boyce-Ditto Public Library's address.
Date: August 31, 1967
Creator: Sikorsky, Igor I.
Partner: Boyce Ditto Public Library