DPWH Standard Specifications for Project Quality Assurance, Volume IV. Category: Department OrderSub Category: construction-materialsSeries: 2016No: 136File: DO_136_s2016.pdfDate: Tuesday, June 28, 2016Tags: Standard Specifications Project Quality Assurance Volume IV materials BQS 136 Read more about DPWH Standard Specifications for Project Quality Assurance, Volume IV.