Many of the papers relate to the McMahon Bill, an atomic energy bill sponsored by the Army in the USA which failed to get through Congress.

One of two albums which belonged to Henry Blackwell (1851-1928), New York, containing press cuttings, mainly of Welsh and Welsh-American interest, from Welsh, English and American newspapers and journals, 1885-1892.

Papers relating to the Three Landscapes project, comprising research papers, including photocopies, bibliographic records and US Geological Survey information; devising notes; draft, proof and final copies of project publications; project information and administrative papers; performed lectures papers, including research, notes, graphics and draft and final copies of presentations; and draft and final copies of graphic work created during the project.

A copy of a report prepared by William Stepp and Estelle Cremers, 2004, on the house which is situated in Montgomery County, Pennsylvania and placed by the Pennsylvania Historical & Musueum Commission on The National Register of Historic Places in 2004. It was built for Welsh Quaker immigrants in 1720.

Sermons by Thomas R. Jones, Rome, New York State, 22 August 1855, with the names of the places at which some of the sermons were preached.

The file comprises a small group of letters, 1960-1966, from friends and acquaintances relating to David Lloyd's visit to the USA and Canada in 1961.

Photocopies of an article by W. N. Davis, Dinuba, California, relating to Stephen S. Jones and family who emigrated in 1878 from Cardiganshire to Jackson County, Ohio, together with copies of letters from America and from relations in Wales and poetry entered in a literary meeting in Oak Hill, 1893, together with a copy of an undated photoghraph of Stephen and Anna (Morgan) Jones taken in Jackson.

Notebook of Berta Ruck, June 1918-September 1919, containing impressions of wartime life in North Wales and London and of her visit to the USA in 1919, later reworked and incorporated into chapters 16-25 of her autobiographical volume A Story-teller tells the Truth (London, 1935); also included are commonplace entries and extracts from letters received.

A composite volume, probably of Spanish-American origin, containing songs with accompaniment for pianoforte or guitar, and a collection of 'Modinhas e Canҫonetas' by various composers dedicated to Snra. D. Thereza Benedicta of Brito de Cunha by Ignacio José Schlegel. Among the composers represented in the volume are Don José Acuna, José-Francisco Edolo, Joao Ribeiro, Alexandre José Pires, Joao Macedo, and Luiz Antonio Barboza Leitao. The volume is lettered on the upper cover and on the spine 'Vocal Spanish'.

Biographical and bibliographical notes and collectanea; four letters, 1872, from Evan M. Williams, Mineral Ridge, Ohio, an emigrant from Merthyr Tydfil, to his parents and brother in Wales; copies of two letters [1925] from Leah Hughes, Brooklyn, an emigrant from Bodfari; etc.

Two groups of letters from Welsh emigrants to America, 1846-1847, 1870-1878, together with letters relating to emigration from Wales, 1948-1955.

A report entitled 'Highway Landscaping in the United States', 1966.

Two essays by John Robert Pryse ('Golyddan'): 'Mantais a ddeillia i'r Cymro o feddu gwybodaeth gyffredinol o'r iaith Seisnig', and 'Yr Ymraniad yn America'.

One of two volumes containing extracts from various printed works dealing mainly with American anthropology, etc.

Ten typescript articles and transcripts, 1973-1984, nearly all written or compiled by Dr Clare Taylor, Aberystwyth.
They comprise: (i) 'America 1851-1852', dated April 1973, a translation by Mari Ellis of the diary of Iorthryn Gwynedd (NLW MS 9521A), with an introduction by Clare Taylor; (ii) 'The Phillipps Manuscript: A Chapter in Early Welsh Migration to the West Indies and to the United States', 1973, a transcript of NLW MS 92B with an introduction by Clare Taylor (the introduction only was published, with the same title, in National Library of Wales Journal, 19.3 (Summer 1976), 243-248); (iii) 'A Description of Trinidad 1881-1882', 1973, a transcript of [?part of] NLW MS 17267D; (iv-vii) 'A Victorian Guide to Wales', 1973 and undated, four volumes containing transcripts from nineteenth-century trade directories of descriptions of individual parishes in Anglesey, Caernarvonshire, Denbighshire and Montgomeryshire; (viii) an article, 1979, entitled 'The Journal of an Absentee Proprietor: Nathaniel Phillips of Slebech', concerning NLW, Slebech Estate Records 4292-4302; (ix) 'Isaac Williams of Cardiganshire – the Christian poet – an introduction to his nature poetry', 1984, an article subsequently published in Transactions of the Honourable Society of Cymmrodorion (1986), 115-126; and (x) 'NLW MS 15505 Picton Papers and Letters', [n.d.], consisting of transcripts (and in some cases translations from the Welsh) of letters of Welsh-American interest in NLW MS 15505E, as well as NLW MS 14111D and elsewhere. Items i-iv and viii-ix are photocopied or cyclostyled, while v-vii and x are carbon copies.

A copy of the donor's research on the family of Rowland Rowlands. He married Elizabeth Samuel in the parish of Llanfihangel Ystrad, Ceredigion, in 1830, and later emigrated to Ohio in the USA. Also included are printouts from America Online, 2006, with a biographical note on J. W. Rowlands, 'one of Lima’s leading citizens'.

Newsletters, programmes, publicity material and ephemera connected with Welsh societies in America, 1939-1985; in Canada, 1968-1985; miscellaneous North American Welsh societies, 1970-1985, including the Welsh National Gymanfa Ganu Association, 1970-1985; Women's Welsh Club of America, 1977-1984; Welsh Associated Youth of America and Canada, 1982-1985; Cymdeithas Madog, 1980-1985; and National Welsh-American Foundation, 1982-1984.
Further papers donated in 2005.

Scrapbooks containing press cuttings etc., 1900-1982, relating largely to Welsh drama, theatrical activities and popular entertainment in Wales and amongst Welsh communities in English cities, including material on dramatists of Wales, 1932-1953; drama in Wales, 1922-1982; Welsh actors, 1932-1946; theatre cuttings, 1931-1953; fairs, folklore and folk-dancing in Wales, 1936-1938; children's theatre, 1959-1967; Welsh National Theatre, 1900-1978; and information on theatre in Ireland, Scotland, France, Spain, Germany, Italy, Greece, Russia, America, and other countries.

Records relating mainly to the industrial concerns of the Crawshay family of Cyfarthfa, Merthyr Tydfil, Glamorgan, [1706]-1878, including letters and letter books of William Crawshay I and II and Robert Crawshay, 1806-1877; cash books, ledgers and bankers drafts, 1834-1888; deeds, [1706]-1885; wills, deeds and miscellaneous material, 1801-1838; balance sheets for ironworks, 1810-1867; will, valuation and probate for William Crawshay II, 1865-1869; shares and bills of exchange, 1870-1878; and Hilston Park estate papers, 1838-1862 and Caversham Park estate papers, 1826-1864. The archive represents the working papers of a major ironworking dynasty.

A short biographical sketch of David Samuel transcribed by him from Columbia (1890), a Welsh newspaper published at Emporia, Kansas, U.S.A., and a list, also by David Samuel, of articles contributed by him to various periodicals, 1884-1920.