Note 6 — FLORA OF THE PRIMARY OR PALÆOZOIC PERIOD.
Reading edition
See Hall's Coal-fields of Great Britain, 1861; Roscoe's Lectures on Coal, Manchester, 1866-67; Hunt's Mineral Statistics of Great Britain; Taylor's Statistics of Coal, 1855-56.
Reading edition
See Hall's Coal-fields of Great Britain, 1861; Roscoe's Lectures on Coal, Manchester, 1866-67; Hunt's Mineral Statistics of Great Britain; Taylor's Statistics of Coal, 1855-56.