found: His Howard Hall's Guide to successful underwater photography, 1982:t.p. (Howard Hall)
found: His A charm of dolphins, c1993:CIP t.p. (Howard Hall) data sheet (b. 12/18/49)
found: Coral reef adventure, 2003:credits (Howard Hall, director of photography)
found: Howardhall.com, July 16, 2015:(Howard Hall is best known for photographing underwater Imax films; co-owner of Howard Hall Productions with his wife Michele; holds a B.S. in zoology from San Diego State University)
found: Familysearch.com, July 16, 2015:(Howard W. Hall, residing in Del Mar, California)