. Elements of acoustical engineering. Electro-acoustics; Sound. FREQUENCY 100 FREQUENCY UNIDIRECTIONAL 2 FEET. UNIDIRECTIONAL 5 FEET C°20 >2 -100 FREQUENCY 1000 D 20. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Olson, Harry Ferdinand, 1901-. New York, D. Van Nostrand company, inc.

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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity