1. Relationship of size and composition in pebble counts;Boggs;J. sedim. Petrol.,1969
2. The glacial deposits around Hertford;Clayton;Proc. Geol. Ass.,1958
3. Size distribution of rock types in stream gravel and glacial till;Davis;J. sedim Petrol.,1958
4. Towards a Pleistocene time-scale;Evans,1971
5. Middle Pleistocene sedimentary sequences in East Anglia (United Kingdom);Gladfelter,1975