Mae'r cwcis hyn yn gwbl angenrheidiol ar gyfer weithrediad y wefan.
Rydym yn defnyddio Google Analytics i fesur sut ydych yn defnyddio'r wefan er mwyn i ni ei wella yn seiliedig ar angen defnyddwyr.
Gall y cwcis hyn gael eu gosod gan wefannau trydydd parti a gwneud pethau fel mesur sut rydych yn gwylio fideos YouTube.
Amgueddfa Cymru
A paper by J. Cowan read before the meeting of the Mining Institute of Scotland, 4 April 1951, and two cover notes (all held together by a staple) The first cover note is typed in black ink on cream paper explaining where and when the paper was given. The second cover is also typed in black ink on cream paper, giving a synopsis of the paper. The paper itself is 13 pages long, typed in black ink on cream paper. It contains some written notes in pencil alongside the text.