Characterization of Mortar from Church Ruins in Barangay Budiao, Daraga, AlbayJohn Carlo A. Mangay, Eric T. Miranda, John Mark S. Anicas, Angel S. Recto and Jan-Michael C. CaymeMATEC Web Conf., 213 (2018) 02001DOI: https://doi.org/10.1051/matecconf/201821302001