Authority of the Bureau of Research and Standards to Conduct Inspection in DPWH Construction and Maintenance Projects. Category: Department OrderSub Category: infra-projSeries: 1990No: 168File: DO_168_S1990.pdfDate: Wednesday, August 22, 1990Tags: Authority Bureau Research Standards Inspection Construction Maintenance Projects infra 168 Read more about Authority of the Bureau of Research and Standards to Conduct Inspection in DPWH Construction and Maintenance Projects.