Chwarel y Penrhyn, gan W. J. Roberts Eitemau 5 items Math Casgliadau Uwchlwytho gan William John Roberts (1906-1982)
Swyddfa Ponc Twrch, Chwarel y Penrhyn, Bethesda, Medi 1974 Math Eitemau Uwchlwytho gan William John Roberts (1906-1982)
Shed Ponc Leval, Chwarel y Penrhyn, Bethesda, Ionawr 1975 Math Eitemau Uwchlwytho gan William John Roberts (1906-1982)
Cyf.1 o lawysgrif am hanes Chwarel Penrhyn, Bethesda, gan W. J. Roberts, c.1970 Math Eitemau Uwchlwytho gan William John Roberts (1906-1982)
Cyf.2 o lawysgrif am hanes Chwarel Penrhyn, Bethesda, gan W. J. Roberts, c.1970 Math Eitemau Uwchlwytho gan William John Roberts (1906-1982)
Cyf.1 (trawsgrifiad) o lawysgrif am hanes Chwarel Penrhyn, Bethesda, gan W. J. Roberts, c.1970 Math Eitemau Uwchlwytho gan William John Roberts (1906-1982)
Cyf.2 (trawsgrifiad) o lawysgrif am hanes Chwarel Penrhyn, Bethesda, gan W. J. Roberts, c.1970 Math Eitemau Uwchlwytho gan William John Roberts (1906-1982)
Tudalennau'r mynegai ar gyfer llawysgrif am hanes Chwarel Penrhyn, Bethesda, gan W. J. Roberts, c.1970 Math Eitemau Uwchlwytho gan William John Roberts (1906-1982)
Geographical and Geological Maps, Hook, Pembrokeshire Math Eitemau Uwchlwytho gan Hook History Society
Specimens of Rocks. Proof of an Illustration for Wright's 'Globe Prepared for Man'. Math Eitemau Uwchlwytho gan Yale Center for British Art
Sir Andrew Ramsay Math Eitemau Uwchlwytho gan Llyfrgell Genedlaethol Cymru / The National Library of Wales
The Reverend William Buckland, D.D. F.R.S Canon of Christ Church and Professor of Geology and Mineralogy in the University of Oxford. 1833 Math Eitemau Uwchlwytho gan Llyfrgell Genedlaethol Cymru / The National Library of Wales
Arthur Aikin Esq.re F.L.S. Cor. Acad. Dij Secretary to the society for the encouragement of arts, manufactures & commerce Math Eitemau Uwchlwytho gan Llyfrgell Genedlaethol Cymru / The National Library of Wales
The Late Professor Phillips Math Eitemau Uwchlwytho gan Llyfrgell Genedlaethol Cymru / The National Library of Wales
Sir Warington Wilkinson Smyth Math Eitemau Uwchlwytho gan Llyfrgell Genedlaethol Cymru / The National Library of Wales
Photographs of the Cardiff Naturalists' Society Centenary Celebration at the National Museum Wales, Cardiff, 23 September 1967 Math Eitemau Uwchlwytho gan VCS Chronicle
Invitation to a Reception at the National Museum Wales, to commemorate Cardiff Naturalists' Society Centenary, Cardiff, 23 September 1967 Math Eitemau Uwchlwytho gan VCS Chronicle
Cardiff Naturalists' Society. Photograph of Group Members: Centenary Celebrations, Cardiff, September 1967 Math Eitemau Uwchlwytho gan VCS Chronicle
