X0306 4 2013-04-01 1 0000875357 BOK FINANCIAL CORP ET AL BOKF 0001290013 Cotter Charles E C/O FREDERIC DORWART, LAWYERS 124 EAST FOURTH STREET TULSA OK 74103 0 1 0 0 Chief Credit Officer /s/ Frederic Dorwart, Power of Attorney 2013-04-05