@inbook {Ballard1979c,
	title = {{Research submersibles: Explorers of the ocean depths}},
	booktitle = {Britannica Yearbook of Science and the Future},
	volume = {1979},
	year = {1979},
	pages = {46{\textendash}61},
	publisher = {Encyclopaedia Britannica},
	organization = {Encyclopaedia Britannica},
	address = {Chicago, Ill.},
	isbn = {0068-1199},
	author = {Ballard, R D}
}
