Because of its unique geology, Minnesota can be divided into four agricultural regions: southcentral region one (corn, soybeans); west-central region two (wheat, corn, soybns); northwest region three (wheat, sugar beet, potatoes); and northeast region four (forested and urban in character). Cancer morality (1980)(1981)(1982)(1983)(1984)(1985)(1986)(1987)(1988)(1989)