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| #252 | Newsletter, IEEE Audio and Electroacoustics Group. -- New York : Institute of Electrical and Electronics Engineers, 1970-1973. -- ISSN 2168-3069 print. -- ISSN 2168-3050 online |
| #253 | Newsletter, IRE Professional Group on Audio. -- New York : Institute of Radio Engineers, 1950-1952. -- ISSN 2168-3026 print. -- ISSN 2168-3018 online |
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