Results of the five year study are presented in this report. The Penn Grade Micellar Displacement Project was a test of a Microemulsion Flooding process on typical post-waterflood Bradford Third Sand Reservoir. The project was located on Pennzoil's Lawry Lease in the heart of the Bradford Field in Northern Pennsylvania. The tertiary oil recovery system was Marathon Oil Company's Maraflood Process which utilized a custom designed micellar slug system and biopolymer mobility buffer. The project was conducted in two parts. Phase I consisted of the drilling, coring, and utilization of well No. HO-68 to determine the injectivity characteristics of Maraflood process fluids. Phase I occurred from July 1975 through July 1976 and the favorable results led to a decision to proceed with Phase II, the 24-acre project. Phase II, the development, operation, and evaluation of a 24-acre Maraflood test occurred from March 1976 through December 1980. Since mobility control was not maintained during the project and could not be achieved by increased viscosity because of already inadequate injection rates, a decision was made to terminate project operations on November 20, 1980. The cumulative oil recovery was only 5.19% of the estimated pre-project oil in place so the project has to be considered a failure. Appendix A discusses the oil recovery efficiency in more detail.