Prior Clearance/Approval by Secretary of Nominated Subcontractors Category: Department OrderSub Category: contracts-contractorsSeries: 1989No: 156File: DO_156_S1989.pdfDate: Monday, October 16, 1989Tags: Prior Clearance Approval Secretary Nominated Subcontractors 156 Read more about Prior Clearance/Approval by Secretary of Nominated Subcontractors