The En Passant Archive, spanning the dates 1970 – 1983, is the archive of the little poetry magazine En Passant, edited by James Costello in Wilmington, Delaware. The 1.3 linear feet of material in the collection consists of letters from contributors, administrative correspondence, little magazines, including twelve issues of En Passant, and the manuscripts of most of the thirteen issues of the magazine published between 1975 and 1983.

The Wilbert Snow letters to Homer E. Woodbridge were written by twentieth century American poet and scholar Wilbert Snow to Homer E. Woodbridge, both of whom were professors at Wesleyan University in Middletown, Connecticut.