Columbia subject headings:
Gifford lectures.
Gifford, Adam, 1820-1887.
Natural theology.
Harvard subject headings:
Gifford lectures.
Gifford, Adam, 1820-1887.
Natural theology--History of doctrines--20th century.
Natural theology.
Princeton subject headings:
Gifford lectures.
Gifford, Adam, 1820-1887.
Natural theology.