Columbia subject headings:
Copying machines--History.
Copying processes--History.
Copying.
Jefferson, Thomas, 1743-1826.
Machinery.
Harvard subject headings:
Copying machines--History.
Copying processes--History.
Jefferson, Thomas, 1743-1826--Views on copying.
Jefferson, Thomas, 1743-1826--Views on machinery.
Princeton subject headings:
Copying machines--History.
Copying processes--History.
Jefferson, Thomas, 1743-1826--Views on machinery.
Jefferson, Thomas, 1743-1826.