Overview MABEL STEWART LUDLUM [aka: "Sister Mabel"; Mrs. Seymour Dewitt Ludlum] 1. Undated correspondence from Mabel Ludlum to Dorothy Stewart: There are seven letters and one short note from Ludlum to Stewart in this archive and in this binder, Sept. 13, [1939] - Feb. 12, 1945, written from her residences in Philadelphia, PA and Keene Valley, NY. One letter is fragmentary [only the last page is extant], and it was written circa Sept. 1944, referring to an exchange of letters between Ludlum and...