R.R. Bowker, the US ISBN Agency
R.R. Bowker is the authorized ISBN Agency in the United States, responsible for assigning ISBNs as well as providing information and advice on the uses of the ISBN system to publishers and the publishing industry in general. (An ISBN, or International Standard Book Number, is a 10-digit number that uniquely identifies books and book-like products published internationally.) Their website includes instructions for publishers or self-published authors to obtain an ISBN for their titles.
Source: http://www.isbn.org/standards/home/index.asp
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