I know many of us say that we didn’t learn anything of value in high school, but I think I have just forgotten it all. When I was a junior in Albert Sidney Johnston High School in Austin, Texas I had a wonderful Algebra II teacher, Mr. Schwartzman. He must of written a book because he was very focused on the ISBN. He showed us a mathematical formula for determining if the book had the correct ISBN number. It utilized the number after the hyphen, but other than that, I can’t remember. It has only been a short 25 (twenty-five) years, but my memory is fading fast. Can you help?
Depending on perspective, I have a hard time cataloging my books with most major options (such as librarything.com) because I have many that predate the ISBN numbers, most certainly predate UPC codes and putting the wrong info into a database, is, well, wrong.
I have the page opened to learn all I want to know about ISBN, so maybe I can figure out what number the books WOULD have had, had they been published in that era.
Then again, I do wish to catalogue my books according to the dewey decimal system and have a card file just like libraries USED to. How I miss those.