Ruth V. Powers
发表
Clarence T. Van Meter,
Ruth V. Powers,
Morris Plotkin,
1969
.
Ruth V. Powers,
Helen N. Hill,
Margaret Milne,
1972
.
Ruth V. Powers,
Morris Plotkin,
Helen N. Hill,
1974
.
Ruth V. Powers,
Morris Plotkin,
Helen N. Hill,
1972
.
Ruth V. Powers,
Helen N. Hill,
David Lefkovitz,
1968
.
Clarence T. Van Meter,
Ruth V. Powers,
David Lefkovitz,
1967
.
Ruth V. Powers,
Helen N. Hill,
1971
.