Subject ASC0001ddb
The Quarterly journal of the Geological Society of London.
v.49 (1893), Page 164 (1893)
Natural History Museum Library, London
BHL Page 45958770
Keywords
geology drawings of microscopic images of rock coupes X 30 suggests 30 times enlargement X 3 suggests 3 times enlargement X 15 suggests 15 times enlargement X 20 suggests 20 times enlargement volcanic rocks Variolite Volcanic Rocks LLeyn no idea rocks microscopic view