Sundaram, R.K. Proceedings of section 13 - Charnockites - 1 - 255 - Memoir for parts of sheets 22 Maryport, 23 Cockermouth, 24 Penrith, 28 Whitehaven, 29 Keswick, 30 Appleby, 31 Brough and 48 Ulverston . ISBN: 0-85272-484-5