ALS signed “R. E. Byrd,” one page, 8.25 x 10.75, personal letterhead, May 3, 1939. Letter to Collier, Jr. In full: “I greatly appreciate your invitation to participate in your radio program and regret that circumstances will not permit me to consider your offer. I am now working day and night on preparations for my next expedition which makes it impossible for me to take on anything more.” In a handwritten postscript, he adds: “It is really splendid of you to think of me.” In fine condition, with a couple horizontal folds. Provenance: William Collier Family Collection. RR Auction COA.