Columbia subject headings:
Blackie, John Stuart, 1809-1895.
Drummond, Henry, 1851-1897.
Hardie, James Keir, 1856-1915.
Nicoll, W. Robertson (William Robertson), Sir, 1851-1923.
Overtoun, John Campbell White, Baron, 1843-1908.
Smith, W. Robertson (William Robertson), 1846-1894.
Harvard subject headings:
Princeton subject headings:
Blackie, John Stuart, 1809-1895.
Drummond, Henry, 1851-1897.
Hardie, James Keir, 1856-1915.
Nicoll, W. Robertson (William Robertson), Sir, 1851-1923.
Overtoun, John Campbell White, Baron, 1843-1908.
Smith, W. Robertson (William Robertson), 1846-1894.