Columbia subject headings:
Black, Joseph, 1728-1799.
Geologists--Scotland--Biography.
Hutton, James, 1726-1797.
Scientists--Scotland--Biography.
Harvard subject headings:
Princeton subject headings:
Black, Joseph, 1728-1799.
Geologists--Scotland--Biography.
Hutton, James, 1726-1797.
Scientists--Scotland--Biography.