...and, quite remarkably for a calculus textbook that is still in use at many schools ~40 years later, the editions you and I bought at Caltech in the late &#x27;70s are the <i>same</i> editions that are used today. Volume I, second edition, 1967, and Volume II, second edition, 1969.<p>I wonder if there are any families where a parent went to such a school and bought these, and then their child went to such a school and used their parent&#x27;s copies, and then their child did the same?