The original printed finding aid was converted into an EAD document in October 2020. There is additional description in the printed finding aid that was not included in the EAD document, specifically, a list of books from Rushmore's collection that have been separated from the Millay papers and individually cataloged in the Rare Book collection (pp. 2-5 of this PDF, numbered pp. 5-8, starting with the "Books by Millay" heading). The list from the original printed finding aid is available here as a pdf.
These items can be found by searching the Libraries' online catalog here