'William Smith's 1815 map "of New England and Wales" showed these rock layers in different colors'
strata
GEOLOGY: William Smiths 1815 map of New England and Wales showed these rock layers in different colors
William Smith's 1815 map "of New England and Wales" showed these rock layers in different colors
William Smith's 1815 map "of New England and Wales" showed these rock layers in different colors
GEOLOGY
strata
GEOLOGY