Seventy holograph letters, 1844 and undated, largely relating to geological studies in Wales and elsewhere, written to A. C. Ramsay by Sir H[enry] Thomas] de la Beche from London, Aberystwyth, Tregaron, etc., W. Talbot Aveline, Ludlow, H. W. B[ristow], Presteigne, etc., Edward Forbes, Geol[ogical] Society], J. P. Nichol [from Dowanhill Observatory], John Phillips, T[rinity] C[ollege], Dublin, etc., Lyon Playfair, from Manchester, etc., Warington W. Smyth, Bedford, Chelsea, Llandegley, Manchester, etc. (ref. to sulphurous waters at Llandegley), Trenham Reeks, Museum [of Economic Geology], James Sharpe and John Sharpe, Glasgow, etc., W. R. Steuart Williams, Llandovery, etc., and John Wilson, Haddington and Aberystwyth; together with thirteen holograph letters, 1844, and undated, largely of a personal nature, written to A. C. Ramsay by William H. Baily from [London], John H. Barry, Liverpool, his cousin John Crombie, Edinburgh, his cousin J. Crombie, from [Glasgow], T. Evans, Eleanor Howden , [Edinburgh] and Bangor (an account of a tour of North Wales), G. McGlure, Helensburgh, Thomas Nimmo, Berbice [British Guiana], T. Todrick, Haddington, and W. Walton, Bath, a copy of a letter, 1844, from George Jones of the British and Foreign Institute to 'Mr. Punch', and a letter, 1839, from And[rew] C. Ramsay, Glasgow, to 'Robin' [Howie] (personal) ( found in the portable desk of Dr. Howie and re-addressed to the writer from Glasgow, 1844). Some of the letters are addressed to the Geological Museum, Charing Cross, London, and to the Ordnance Geological Survey at Dolau Cothi, Builth, and Rheadir Gwy.