- isbn-type STRINGprocedure
Returns 10 for ISBN-10 and 13 for ISBN-13 numbers or #f if no valid number has been given. This function has been added with version 0.2 of this egg.
Returns 10 for ISBN-10 and 13 for ISBN-13 numbers or #f if no valid number has been given. This function has been added with version 0.2 of this egg.