Title: Shells of Florida's Atlantic Coast, Author: J. DOUGLASS
Title: Marine Mammals of the Pacific Northwest: including Oregon, Washington, British Columbia and Southern Alaska, Author: Pieter Folkens
Title: A Field Guide to Nudibranchs of the Pacific Northwest, Author: Rick M. Harbo
Title: Marine Biodiversity of Costa Rica, Central America / Edition 1, Author: Ingo S. Wehrtmann