This subseries consists of photocopies of 10 letters (9 letters, 1 postcard) written by Nancy Mulnix over the years to Alexander Calder or to his sister Peggy Calder Hayes. Mrs. Hayes is identified primarily in this collection as Margaret Calder Hayes, though she was called Peggy by her family, and by Mulnix. These copies were obtained by Mulnix from the Calder Foundation in September 2005. The transmittal letter is dated Sept. 7, 2005. Some are annotated by her as to date. It is likely that other letters were written by Mulnix to Calder, given the number of responses which she saved from him. The location of Mulnix's other letters to Calder, if they still exist, is unknown.