Unless the original poster was doing his search for physicians practicing in California, I fail to see how those "MD, DOs" are products of the California Merger in the late 1960s. DOs in that mess who received their MDs (for a fee quite a bit more than just $50, actually) were barred from practice in many hospitals within California as well as having their medical licenses invalidated by the other 49 State Medical Boards. In other words, these "MD, DOs" weren't allowed to practice outside the State of California, and as their dumb luck would have it, they also weren't allowed to practice inside the state.