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No, once a title is published with an ISBN in it, the ISBN can never be used again. Even if a title goes out of print, the ISBN cannot be reused since the title continues to be cataloged by libraries and traded by used booksellers.

The term four-color refers to the three process colors of yellow, cyan (blue), and magenta (red) plus black. From these four colors printed in screens of dots, one on top of the other, you can make almost all the colors in the spectrum. Anytime you see a "full-color" photograph printed in a book or magazine, its four-color process. Anytime a cover looks like it has more than two colors, it's probably a four-color cover. The next time you notice a blurry picture in a color newspaper, take a closer look and you'll see how the process works. The picture is blurry because the press was "out of register." Perhaps the cyan ink didn't drop precisely on top of the yellow ink. Sometimes the register is so bad you can actually see the different-color dots.

International Standard Serial Number. According to the pertinent national and international standards (ISO 3297; ANSI/NISO Z39.9) the abbreviation"ISSN" denotes the singular and plural forms, according to context.

The ISSN can be thought of as the social security number of the serials world. Just as an individual's social security number is used in many automated systems to distinguish that person from others with the same or similar names, the ISSN distinguishes a particular serial from others with which it might be confused. The ISSN also helps library patrons, libraries, and others who handle large numbers of serials to find and identify titles in automated systems more quickly and easily.

Unlike the ISBN, which contains country and publisher prefixes, the ISSN contains no inherent meaning.

An ISSN is composed of eight digits: the arabic numerals 0 to 9, except that in the case of the last digit, which is a check digit, the upper case X can appear. The purpose of the check digit is to guard against errors caused by the incorrect transcription of the ISSN. The method of determining the check digit for the ISSN is the modulus 11 basis, using the weighting factors 8 to 2. In the case of the ISSN, the Roman numeral X is used where the check digit calculation results in a remainder of 10

ISSN are assigned by a network of over 60 centers worldwide coordinated by the ISSN International Centre located in Paris. ISSN are assigned to serials published in the United States by the U.S. ISSN Center at the Library of Congress. Serials published outside of the United States are assigned ISSN by the national center in their country of publication, or, in the case of countries lacking a national center, by the ISSN International Centre. Information about the ISSN network and ISSN centers worldwide can be found on the ISSN International Centre's home page.

The U.S. ISSN Center generally only assigns ISSN at the direct request of the publisher or an agent (such as an attorney) acting on the publisher's behalf. Libraries and other ISSN users interested in obtaining ISSN should contact the head of the U.S. ISSN Center, Regina Reynolds, [email protected], to discuss other possible arrangements.

U.S. publishers should complete an application form and send it to the U.S. ISSN Center together with a representation of the serial (either a sample issue, or a photocopy of the cover, title page (if present), masthead, publisher information, and any other pages giving information about the serial.

There is no charge for the assignment of the ISSN, or for the use of an ISSN once assigned. (However, the Library of Congress incurs substantial costs to staff and maintain the U.S. ISSN Center. Additionally, the Library of Congress is assessed a considerable fee to belong to the ISSN Network.)

No. ISSN are assigned to the entire serial and stay the same from issue to issue unless you change the title of your serial in any way except to increment the date (e.g., The World of Serials 1996 to The World of Serials 1997).

Title changes are costly for libraries and can be costly to publishers as well. If you must change the title, please apply to the U.S. ISSN Center for a new ISSN at least a month in advance. If you are in doubt as to whether a contemplated title change would require a new ISSN, please contact the center ([email protected]). The Whats in a Name? brochure has further information about the costs of serial title changes.

That depends. For most serials one ISSN for each title under which it has been published is sufficient. But, if your serial is published in different language, regional, or physical editions (e.g., print, electronic), you will probably require a separate ISSN for each edition. Further information about electronic serials is available.

The preferred location for printing the ISSN on a printed serial is on the upper right-hand corner of the cover. Other good locations are the masthead area, the copyright page, or in the publishing statement where information about the publisher, frequency, and other publication facts are given. On a non-print serial, the ISSN should be printed, if possible, on an internal source, such as on a title screen or home page. Other suggested locations on non-print serials are on external sources such as microfiche headers, cassette or disc labels, or other containers. If a publication has both an ISSN and an ISBN, each should be printed. If a publication is in a series which has its own ISSN, both ISSN should be printed, accompanied by the title to which it pertains.

No. The ISSN office only needs to see one published issue either at the time of registration, or after publication, for ISSN issued prior to the publication of the first issue of a serial. However, please see Copyright Circular 7d, Mandatory Deposit of Copies or Phonrecords for the Library of Congress for information on Copyright deposit requirements you may be subject to.

ISBN or International Standard Book Number is the book counterpart to the ISSN. It is a national and international standard identification number for uniquely identifying books, i.e., publications that are not intended to continue indefinitely.

Yes. This situation occurs most commonly with books in a series and with annuals or biennials. The ISBN identifies the individual book in a series or a specific year for an annual or biennial. The ISSN identifies the ongoing series, or the ongoing annual or biennial serial.

CIP or Cataloging in Publication information is only available for books. So, unless the cataloging in publication data is for an individual book in a series, a publication will not normally be eligible for both cataloging in publication and ISSN.

There is no connection between Copyright and ISSN. Having an ISSN does not confer any Copyright protection, nor does sending a serial to the Copyright office eliminate your need to send the U.S. ISSN Center a sample issue of a serial for which you were given a pre-publication ISSN.

No. Getting an ISSN for a title does not confer any exclusive rights to that title. Nor can titles be copyrighted. The best way to protect a title is to register it with the U.S. Patent & Trademark Office.

No. The U.S. Postal Service uses the ISSN as an identification number for certain publications mailed at second class postage rates, but all publications have to meet the same requirements for a second class mailing permit regardless of whether they have an ISSN or not. Contact your local postmaster about obtaining a second class mailing permit.

The ISSN is used in several bar codes as the title identifier portion of the code. One such code, the SISAC bar code symbol, can be found on scholarly, technical, medical and other subscription-based serials. The SISAC symbol is used by libraries and library-affiliated organizations. The symbol can also represent articles within journals and is used by document delivery services. The other major bar code that uses the ISSN is the EAN (International Article Number). The EAN is used in the U.S. by major bookstore chains for trade and other book publications. It is used extensively in the U.K. for magazines.