21
22
23
24
25
Published [1982]

Report Number(s): APA 416 APA 1335 SUS 116 SUS 117

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28
by Ballard, Warren B.
Published 1979.

Report Number(s): APA 3137

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29
by Ballard, Warren B.
Published [1980]

Report Number(s): APA 524 APA 947

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