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Baseline data report.

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Item Link Original Source
Limited (search only)   v.16-17 1984/85 Pennsylvania State University
Limited (search only)   v.18-19 1986/87 Pennsylvania State University
Limited (search only)   v.20-22 1988-90 Pennsylvania State University
Limited (search only)   v.23-v.24 no.3 1991/92 Pennsylvania State University
Limited (search only)   v.25-26 &Special Data Issue Pennsylvania State University