A conjectural palaeogeological map of Wales & England, south of the latitude of Manchester and north of the Variscan front ... as in End-Silurian times ... /
Wills, Leonard Johnston.
London : Geological Society,
1977.
Accompanies: A palaeogeological map of the Lower Palaeozoic floor below the cover of Upper Devonian, Carboniferous and later formations [By] L.J. Wills. (Memoir Geological Society of London, no. 8). Published 1978.