1. A multiple till sequence formed by a late Devensian Welsh ice cap: Glanllynnau, Gwynedd;Boulton;Studies in the Welsh Quaternary, Cambria,1977
2. Evaluation of exploration methods for coarse aggregates in south east Dakota;Bruce;S. Dakota Geol. Surv. Rep.,1964
3. The evaluation of Scottish sand and gravel resources;Chester;Scott. Geogr. Mag.,1980
4. Predicting the quality of sand and gravel deposits in areas of fluvioglacial deposition;Chester,1982
5. Late glacial environmental change indicated by Coleopteran successions from North Wales;Coope;Boreas,1972