Infrasound noise - noise in which infrasound frequencies are found. The range of literature accepted varies from 1 or 2 Hz to 16 or 20 Hz. According to ISO 7196: 1995, ISO 9612: 1997 and PN-Z-01338: 2010 are ranges from 1 to 20 Hz. Infrasound noise is commonly found in the vicinity of roads, cities and industrial plants. The development of infrasound technology and the growing proportion of populations exposed to this type of noise has increased the interest in its impact on human health. Bibliography
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List 44
Open letter to the Sejm of the People's Republic of Poland, from the number of signatories also referred to as the Letter of forty-four (Letter 44) - a document deposited at the Chancellery of the Polish People's Party (April 29, 1982), in protest against internment and other Resolutions met the activists of NSZZ Solidarność after the imposition of martial law on December 13, 1981. The letter was signed by forty representatives of various professions (architects, teachers, doctors, economists, engineers, actors), Solidarity sympathizers, especially from the Jelenia Góra Region. wiki
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