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The genesis of the Yorkshire chalk
Mortimer, J R (1825-1911)
[1909]
Reprinted from the Proceedings of the Geologists' Association, vol. xxi, part 2, 1909.
A description of the origin and distribution of the unwater-worn chalk-gravel on the Yorkshire chalk hills : supplemented by an account of neighbouring and somewhat contemporanious deposits
Mortimer, J R (1825-1911)
[189-?]
Reprinted from Proceedings of the Geologists' Association, vol. VIII, no.5.