Incoming Resources
- Butterworth, Washington, 1966
- Butterworth, London, Boston, 1977
- Butterworth, London, 1964
- Butterworth, Boston, 1981
- Butterworth, Washington, 1962
- Butterworth, London, 1975
- Butterworth, Toronto, 1975
- Butterworth, Boston, 1984
- Butterworth, London, 1957
- Butterworth, London, 1951
- Butterworth, London, 1973
- Butterworth, Washington, 1964