0000950134-99-005658 424B5 1 19990623 BOK FINANCIAL CORP ET AL 0000875357 6021 731373454 OK 1231 424B5 33 333-65629 99651057 BANK OF OKLAHOMA TOWER PO BOX 2300 TULSA OK 74192 9185886000 BANK OF OKLAHOMA TOWER P O BOX 2300 TULSA OK 74192 424B5 1 000095013499005658-001-seq1-424b5.txt PRELIMINARY PROSPECTUS SUPPLEMENT-FILE #333-65629