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A Frenzy of Sharks: the Surprising Life of a Perfect Predator - Howard Hall - 0976613441 Howard Hall's Guide to Successful Underwater Photography - Howard Hall - 0932248039 Secrets of the Ocean Realm - Michele Hall, Howard Hall - 0786704535 Sharks: the Perfect Predators - Howard Hall - 0382248910 The Kelp Forest: the Ebb and Flow of Life in the Sea's Riche - Howard Hall - 0382248643