Robert J. Harper
发表
John V. Benitate,
Robert J. Harper,
1987
.
Robert J. Harper,
David A. Yeadon,
Darrell J. Donaldson,
1983
.
Robert J. Harper,
David A. Yeadon,
Darrell J. Donaldson,
1981
.
Robert J. Harper,
Darrell J. Donaldson,
Hubert H. St. Mard,
1979
.