Books by Dennis J. Hwang:
Books in the extended shelves:
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Hwang, Dennis J.: Beach changes on Oahu as revealed by aerial photographs (State of Hawaii, Dept. of Planning and Economic Development, 1981), also by Hawaii Institute of Geophysics, University of Hawaii (Honolulu). Urban and Regional Planning Program, and Hawaii Department of Planning and Economic Development (page images at HathiTrust)
Find more by Dennis J. Hwang at your library, or elsewhere.