4
5
6
7
by Ballard, Warren B.
Published [1981]

Report Number(s): APA 2691

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10
12
by Ballard, Warren B.
Published 1979.

Report Number(s): APA 3137

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13
by Ballard, Warren B.
Published [1980]

Report Number(s): APA 524 APA 947

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