RBRN
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The Republic Book Registration Numberis a numeric system of book catalogue developed in 1967 AoN. All books printed or imported into the Republic of United Provinces is required to have one for better identification.
A different RBRN number is given to every book, including hardback, softcover, and digital titles with those made within the Republic get a ten digit number while those made outside the Republic are given a 13 digit number with the addinitional three numbers denoting country of origin, province of origin, and original language.