Hagonoy, Angelbert C. <br/><br/>
Rice hull ash partial replacement of cement in concrete hollow blocks/ 
Hagonoy, Angelbert C.| Sebuco, Ronesil E.| Sumicad Sammy R. 
 - Mati, San Miguel, Zamboanga del Sur;  J.H. Cerilles State College,  2020. 
 - 46p.  ill.