Major collections include:

Wallace Ludwig Anderson Archive
James B. Connolly
Thomas Hardy
Sarah Orne Jewett
Wesley McNair
Edwin Arlington Robinson
Vernon Lee

James A. Healy Collection of Irish Literature
Pestana Collection of World War I Materials
Porter Collection of Contemporary Literature

Special Collections also has smaller collections of the following

Thomas Bailey Aldrich
Waldo Peirce
Booth Tarkington
Celia Thaxter