...."Each state has a Board of Nursing which is responsible for setting requirements and licensing nurses who practice in that state. Registered Nurse is the name of the license granted to professional nurses. To earn an RN license, you must pass a comprehensive nursing test, called the NCLEX® examination, which is administered by each state. But to qualify to sit for the NCLEX examination, you must first complete a nursing education program that is approved by your state's Board of Nursing.
Many states also require continuing education after you are licensed to keep your nursing license current."
Don't know if that was the practice back then or not, but it's worth a shot, don't you think?