The Iowa State Board of Regents hereby recognizes the United Faculty as the certified, exclusive and sole bargaining representative for those Faculty Members set forth in the PBRB certification instrument (Cases 590 and 603) issued by the PERB on the third (3rd) day of December, 1976, as modified by the "Amendment of Bargaining Unit and Certification" (Case 1252) issued by the PERB on the 27th day of October, 1978, and as modified by the "Amendment of Certification" (Case 2125) issued by the PERB on the 9th day of February, 1983, and the PERB order NUNC PRO TU~C filed March28, 1983.