This collection consists of 580 objects from the Frances Mulhall Achilles Library at the Whitney Museum of American Art. The Library serves as a comprehensive research collection in the field of twentieth-century and contemporary American art. It was originally built on the foundation of Gertrude Vanderbilt Whitney’s personal collection of books and papers. The Library provides researchers a gateway for easy access to a wide range of research materials through the electronic catalog, WhitneyCat, which contains the bibliography of the Whitney’s reference collection of over 40,000 books, exhibition catalogs, and periodical titles. In addition, the Library’s holdings include the Special Collections, vertical files, and the Museum Archives. The Whitney Artists’ Correspondence and Ephemera project brings focus to a specific selection of extraordinary material found in the Whitney’s Library and Archival collections. These letters, notes, personalized announcements and invitations represent a view of the thoughts and conversations between Museum staff and the artists they represented, and provides a window into the changing tastes of the viewing public and art market.