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Sonic Depth Sounder for Laboratory and Field Use

Everett V. RichardsonDaryl B. SimonsGerald J. PosakonyG. J. Posakony

出版	U.S. Department of the Interior, Geological Survey, 1961
URL	http://books.google.com.hk/books?id=SyXVuBwYoAEC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN