The collection consists of manuscripts, typescripts, page proofs, galley proofs, correspondence and original illustrations of early books published by the Dolmen Press, comprising some of the work of about 25 writers. Included among these authors are Austin Clarke, Padraic Colum, Thomas Kinsella, and Richard Murphy. Also included are translations of earlier works in Irish and an edition of one of W. B. Yeats' works.
The fonds consists of correspondence received by Montague in his capacity as editor plus a few carbons of his replies. Correspondents include Peadar O'Donnell, Liam Miller, Thomas Kinsella, and some of the other contributing writers: Aidan Higgins, Pearce Hutchinson, Val Iremonger, John Jordan, James Liddy, John McGahern, Brian Moore, Richard Murphy, James Plunkett, Richard Weber, Leslie Daiken, and Thomas McIntyre. There are also some miscellaneous letters and items; including letters from Samuel Beckett and Robin Skelton. Included with the correspondence are a few holograph notes, cuttings, manuscripts, pamphlets, and emphemera relating to The Dolmen Miscellany.
The collection consists mainly of material generated in the process of publishing the book Yeats the Initiate (1986), consisting of typescripts, drafts, paste-ups, illustrations, and proofs; plus correspondence, mainly to Liam Miller at the Dolmen Press.