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More from TodayIFoundOut:
Why Some Countries Refrigerate Their Eggs And Others Don't
https://youtu.be/Xbqv1SuQJ0s?list=PLR0XuDegDqP0GESJ0DgpgTcThLJVEbFs8
The Curious Case of the Xzhibit Egg
https://youtu.be/PwCe7P-WzFQ?list=PLR0XuDegDqP3XRa-w_G0dy_aMMXj0Uq-k
In this video:
The number line, or printer’s key, often seen on the copyright page of books is simply a method of record-keeping that helps identify the book’s printing and, for some, year of printing a specific book, which may or may not be different than the original copyright date listed elsewhere on the page.
Want the text version?: http://www.todayifoundout.com/index.php/2016/05/books-copyright-pages-string-numbers-bottom/
Sources:
https://janefriedman.com/5-valuable-charts/
http://www.slideshare.net/PublishersLaunch/the-changing-mix-of-what-sells-in-print-jonathan-nowell-nielsen-book
http://www.abebooks.co.uk/servlet/BookDetailsPL?bi=1418260683&searchurl=&cmtrack_data=cm_abecat%3D100200738
http://www.travelinlibrarian.info/writing/editions/
http://www.emptymirrorbooks.com/collecting/firstedition.html
http://www.booklibris.com/BLFirstEditionID.htm
http://blog.bookstellyouwhy.com/bid/25574
