Preserving the Ifugao terraces a literature review - Zialcita, Fernando N. (Fernando Nakpil); Soco, Andrea; Sarmiento, Ramon Felipe A.; Stanyukovich, Maria V.; Toohey, Aileen; Canilao, Michael P.; Mondiguing, Remedios P.; Roldan, Suzanna R.; Santos, Monica Fa W.; Tamayo, Ann Loreto C. (UNESCO National Commission of the Philippines, 2015)