Subject ASC00011cp
The Quarterly journal of the Geological Society of London.
v.67 (1911), (1845)
Smithsonian Libraries
BHL Page 39749100
Keywords
geology granite rock stone Um Esh Range feldspars quartz arrowhead twin tool gypsum Jubal Island etched figures Granite Felspars quartz arrowhead jubal island mechanically etched fretting block felspars round figures etching rocks utensild pre-history desert Egypt