The Mary Sinton Leitch papers, 1929-1954, 1968 is a collection of her personal works and papers. The papers consist primarily of early drafts of Leitch's writing, draft publications, and correspondence with poets and publishers. This collection provides a unique look into Leitch's creative process and her career as a woman writer in central Virginia during the early and mid 20th century.

Series 1: Stage Plays and Short Stories contains multiple working drafts of Leitch's works of fiction. The printed drafts include annotations and working notes. Some plays, such as The Black Moon and The Unwilling Conspirator, include multiple drafts at various stages of Leitch's creative process.

Series 2: Poetry and Songs make up the bulk of the collection, including typed copies of Leitch's poetry, workbooks of poetry drafts and concepts, and poetry publication proofs. This series contains both published and unpublished poems, organized in alphabetical order by title. Some drafts include notes, corrections, and general annotations. Also included are workbooks and scratch books used by Leitch to workshop poems. These workbooks contain a partially-complete paste-up and a proof book of Leitch's poetry compilation From Invisible Mountains, both of which have some editorial annotations.

The series includes a small number of songs that Leitch wrote and published herself or in collaboration with other songwriters. These songs are all finalized publications free of annotation.

Series 3: Correspondence encompasses Leitch's professional and personal correspondence regarding her works of poetry and fiction with publishers and professional peers. The majority of the correspondence pertains to Leitch submittingher works for publication. Leitch corresponded with other contemporary poets, and she expressed her admiration, requested advice, or planned social engagements. Individuals Leitch corresponded with include poets Robert Frost, T. S. Eliot, Archibald Rutledge, and illustrator J. J. Lankes.

Series 4: Project Files and Subject Files is composed of Leitch's personal files related to publishing, professional and amateur reviews of her works, and research pertaining to her career as a writer. Some examples of the files included in this series are a workbook of submissions made to publishers, paste-up books of reviews of her poetry, and contact sheets for Virginia Poetry Society members.