Let’s assume you cannot find the original Priimer PDF. Do not panic. You can build the same foundation using a better, updated learning path.
Resources like —originally authored by Saba Zamir and Chander Ranade—provide a foundational roadmap for navigating this complex but critical language. What is the MVS JCL Primer?
: Originally by McGraw-Hill (1994), with reprints appearing as recently as 2007 by McGraw-Hill Education India.