The file consists of a notebook containing a personal account of a journey through North Wales undertaken in September 1963, beginning at Llyn Mair and Rhyd, and ending with Coed y Rhygen, describing scenery, geology, botanical habitats, birds, plants, natural and man-made features of the landscape, and suggestions for photographs, and a few, unrelated notes on Llangrannog and Cwmtudu. The material served as the basis for his The Snowdonia National Park published in 1966.