Two items signed by the North Pole explorers: an ALS signed “Felix Riesenberg,” one page, personal letterhead, 7.5 x 10.5, February 11, 1932, in part: “What you think of my books is appreciated. My next novel will be launched in March. Hope you will like it. I have taken for my scene the turmoil of the great depression”; and a Riggs National Bank check, 7.5 x 2.75, filled out and signed by “Walter Wellman Trustee,” payable to “Cash” for $75, April 28, 1909. In overall fine condition.