Legal documents and business letters addressed to Mihangel ap Iwan (d. 1944), 1905-1935, relating mainly to the 'Compania Mercantil del Chubut' and its affairs; notes by Mihangel ap Iwan, including 'Nodiadau ar ymddygiad yr C.M.C. (Cwmni Masnachol Camwy) ...'; letters, or copies of letters, between Mihangel ap Iwan and officials of the company, with printed annual reports and other statements of the company for various years; letters to Mihangel ap Iwan, most of which are of a personal nature, from Ben Davies [1864-1937] (Pant-teg, near Swansea), G. Lloyd Davies (Sarmiento, Buenos Aires), Daniel R. Evans (Gaiman, Chubut), Hugh Griffith (Gaiman), John Washington Jones (Trelew, Chubut), Morgan Ph. Jones (Gaiman), Sarah H. Manton (Buenos Aires), Eluned Morgan ('Eluned') [1870-1938], T. Rhys (Bala-Bangor Independent College), James H. Rowland (Gaiman) and Owen L. Thomas (Buenos Aires), with a copy of a letter to him from the Hon. James L. Davis, Secretary of Labor of the United States, 1926.

297 Mounted 35mm Kodak transparencies taken in Patagonia following his award of a Winston Churchill fellowship . They include views in Welsh settlements in Patagonia such as Trelew, Gaiman, Drofa Dulog, Trevelin and Esquel.

Photographs (76 col, 3 b&w) derived from transparencies and sketches executed in Patagonia, once housed in three magnetic albums (Professional).

Include reproductions of the following Patagonian drawings in collection of NLW - pb07131, pb07109, pb07104 ,pb07114, pb07118, pb07058, pb07110, pb07113, pb07100, pb07127, pb07105, pb07129, pb07156, pb07130, pb07137, pb07112, pb07136, pb07103, pb07111, pb07102, pb07144, pb07106, pb07117, pb07125 & pb07101.