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The Electronic Textbook Track Number (ETTN) is a unique numeric identifier of "Electronic-books, journals and "conference proceedings. ETTN is based upon 13-digit code created by Magnanimitas Assn.
ETTN Codes can be used only for electronic text files. Any publisher, university, researcher or academician could ask for unique code for his/her electronic text generated by Magnanimitas Assn.
ETTN Code consists of 5 parts - AAA-BB-CCCCC-DD-F