Comprised of correspondence primarily between McCarthy and wife Ruphine and his daughter, Rufina, which also includes a few drafts of his poems. Much of his correspondence to Ruphine comes from his time in Washington, D.C. serving on the Knights of Columbus Supreme Board of Directors, Committee on War Activities, between 1918-1919. Also includes printed copies of poems and addresses by McCarthy, as well as some promotional material and articles about McCarthy and his works. There are also programs from events which he addended, some at which he was also a featured speaker. His addresses include one he gave when receiving his honorary doctorate of laws from Boston College.