Consists of original manuscripts; drawings; correspondence by, to, and about Yeats; photographs and portraits; and miscellaneous materials about Yeats. The correspondence by Yeats to his American friends during his residence in New York from 1908 to his death in 1922 is arranged alphabetically. This correspondence is full of sketches and drawings, and some letters include their original envelopes. For each correspondent, the letters are organized chronologically by the date on the letter, not the envelope (unless so noted). All undated correspondence (with any potentially related envelopes) is grouped in a separate folder at the end of the dated folders for each correspondent. (Most of these original letters are represented by typed transcripts in series II, and, since Yeats's handwriting is difficult to read, the reader often will find those research copies useful.) There is also some correspondence to Yeats from various persons, as well other correspondence about Yeats. The correspondence about Yeats is grouped alphabetically by recipient.