By Chaffin Mark S.   Berry John D.   in Journal of the American Helicopter Society

ISSN:2161-6027|42|3|235-243

AHS International‎(1997)‎

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By Thomas Rae   Zimmer-Gembeck Melanie   Chaffin Mark   in Administration and Policy in Mental Health

ISSN:0894-587X|41|3|368-378

Springer Publishing Company ‎(2014)‎

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