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by De Jong, Gordon F.
University Park, Pa. : Middletown, Pa. : Institute for Policy Research and Evaluation, Population Issues Research Center ; Penn State Harrisburg, Institute of State and Regional Affairs, Pennsylvania State Data Center, 1991
University Park, Pa. : Middletown, Pa. : Institute for Policy Research and Evaluation, Population Issues Research Center ; Penn State Harrisburg, Institute of State and Regional Affairs, Pennsylvania State Data Center, 1991
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