http://dewey.info/scheme/a14/ en
621.385 Telephony
621.385092 Telephone engineers
http://dewey.info/scheme/a14/ vi
621.385 Điện thoại
621.385092 Kỹ sư điện thoại
http://dewey.info/scheme/a14/ it
621.385 Telefonia
621.385092 Ingegneri della telefonia
http://dewey.info/scheme/edition/e23/ en
621.385 Telephony
621.385092 Telephone engineers
http://dewey.info/scheme/edition/e22/ de
621.385 Fernsprechtechnik
621.385092 Telefontechniker
Dewey Decimal Classification
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