Subject ASC00012yu
The Quarterly journal of the Geological Society of London.
v.50 (1894), Page [455] (1894)
Smithsonian Libraries
BHL Page 39089241
Keywords
soil profile gravels Twickenham sections layers of soil diagram ground levels sump-holes geology soil sump holes section cross-section loam reindeer-horns Sections of sump-holes Twickenham sumphole gravel