Oceanography: An Observer's Guide
While engaged in professional oceanographic research and teaching, Marshall, like the postman who goes for a hike on Sundays, spent much of his free time cruising in his 30-foot auxiliary sloop. Underway he realized that, with the equipment readily available on vessels, whether large or small, interested observers could learn a great deal about their surroundings. This prompted him, in his retirement, to write Oceanography: An Observer's Guide. It was Professor Marshall's hope that this book would enrich the experience of all who travel on the high seas.