Amendment of Department Order No. 55, s. of 1991, Re: Assignment of Undersecretaries. Category: Department OrderSub Category: areas-responsibilities-authority-designationSeries: 1991No: 130File: DO_130_S1991.pdfDate: Thursday, May 30, 1991Tags: Department Order No. 55S.1991 Re: Assignment Undersecretaries areas Read more about Amendment of Department Order No. 55, s. of 1991, Re: Assignment of Undersecretaries.