After education in Germany, I received immigration to Canada in 1975, entered Canada with family but found a job with a German company which wanted me to work in Germany. So we went back after staying in Canada for about 2 1/2 months. Eventually we immigrated to and became citizens of the U.S. Now retired, we would like to settle in Canada. We still have the documents of immigration and social insurance cards from 1975. What do we need to do to fulfill this desire?