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Elsevier‎(1998)‎

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By Chambers Sharon M.   Weeks Sandy R.   Chaloupka Larry J.   in Community College Journal of Research and Practice

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Routledge Ltd‎(2003)‎

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By Visintainer Joseph A.   Marcolini Michael A.   Burley Casey L.   Liu Sandy R.   in Journal of the American Helicopter Society

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AHS International‎(1993)‎

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