Guidelines in the Implementation of Memorandum Order No. 341 of the Office of the President Authorizing Prepayment of Certain Materials. Category: Department OrderSub Category: construction-materialsSeries: 1991No: 42File: DO_042_S1991.pdfDate: Monday, February 18, 1991Tags: Guidelines Memorandum Order No. 341 Prepayment Certain Materials 042 Read more about Guidelines in the Implementation of Memorandum Order No. 341 of the Office of the President Authorizing Prepayment of Certain Materials.