Columbia subject headings:
Smithson, Alison, 1928-1993.
Smithson, Peter, 1923-2003.
Harvard subject headings:
Architects--England.
Architecture, Modern--21st century
Smithson, Alison, 1928-1993.
Smithson, Peter, 1923-2003.
Princeton subject headings:
Smithson, Alison, 1928-1993.
Smithson, Peter.