1. The fir tree field shaft; the date and archaeological and palaeo-environmental potential of a chalk swallowhole feature;Allen;Proceedings of the Dorset Natural History and Archaeological Society,1998
2. Early Humans;Ashton,2017
3. Composition and origin of some brickearths on the Chiltern Hills, England;Avery;Catena,1982
4. Investigations at Gaddesden Row brickpit, Hertfordshire;Bridgland;Quaternary Newsletter,1989
5. Summary and conclusions;Catt,1978