Oxford Enterprises has been established since 1969.   Mr. Tepper, the president of Oxford Enterprises, is a respected expert on land investment.  Having counseled hundreds of men and women in the precepts of successful real estate investment, Mr.Tepper has spoken to many groups in the field of real estate. He explains, "I've found that in the pursuance of wealth, most men are limited only by their ability to picture themselves successful."   Throughout a quarter of a century in the investment business under Mr.Tepper's leadership, Oxford Enterprises has maintained an immaculate record of integrity and candor.