I have put out a few feelers in vain, so the following «revelation» is not authoritative. The DG may shed light.
According to the Architects of Golf, Bell Sr designed nine holes and Graves is responsible for nine. The MT website advertises a Bell Sr 1964 design, no mention of Graves. I have forgotten the years the book assigns to each nine and have not located a routing or any other records. Last week I saw nothing in the clubhouse and asked in the pro shop. The City of San Diego has not responded to a request for information. Not an exhaustive search, but I will document the «Bell Ringing» here in case I don't get around to it. Bell Sr’s eventual biographer (?) may thank Mike and me. Mike? Read on.
Mike, my golf comrade and mentor, has played the grounds in question since the 60s when they were called Navajo Canyon. He was a kid then, doesn’t remember if the course was 9 or 18. Last week, upon starting the stretch that «speaks to me» (11-16), Mike and I agreed that Bell Sr. must (?) deserve the credit for it, and we began to wonder about the «separation of powers» and how things would have looked without the familiar front nine, assuming it came second (?). No easy task, especially while in pursuit of magic spheres. Next stop was 12 tee, where we sized up the situation—and «lo and behold» we did a double take because before us stood a twin of the tee shot at Bell Sr's 14 on Balboa 18!