EXHIBIT 99.b AMENDMENT NO. 1 TO AGREEMENT AND PLAN OF MERGER AMENDMENT NO. 1 ("Amendment No. 1"), dated as of April 25, 1999, to the Agreement and Plan of Merger (the "Merger Agreement"), dated as of December 14, 1998, by and among ONEOK, Inc., an...Agreement and Plan of Merger • April 26th, 1999 • Oneok Inc /New/ • Natural gas transmisison & distribution • Oklahoma
