12
4
December
663
683
HOLLAND, C. H., RICKARDS, R. B., WARREN, P. T. 1969. The Wenlock graptolites of the Ludlow district, Shropshire, and their stratigraphical significance. Palaeontology, 12, 4, 663–683.
C. H. Holland, R. B. Rickards and P. T. Warren The Palaeontological Association (Free Access)