: What is the number above rrd-h on copywrite page What does the number under the library of congress control number and above rrd-h? The number is 31

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After looking at the copyright pages of several books, there is no standard for placement of library of congress numbers that is broadly applied. In several cases books by the same publisher did not use the same layout. Therefore with confidence I can not only say 'I don't know,' but I can also say 'No one other than god and the publisher can know.'

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