By Richard Ronald B.   Williams Helen   Eckardt Robert E.   in The Foundation Review

ISSN:1944-5679|4|4|28-44

Johnson Center for Philanthropy at Grand Valley State University‎(2013)‎

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By Eckardt Robert   Berger Christian   Thiel Christian   Schmullius Christiane   in Remote Sensing

ISSN:2072-4292|5|6|2973-3006

MDPI‎(2013)‎

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