49 architecture, participated in the architectural survey of the Angkor monuments. He was the leader of the building group of the study team, but passed away in 2012. Professors Shigeeda Yutaka and Choi Byungha, who like Professor Katagiri belonged to the Faculty of Architecture of Nihon University, provided valued advice from the angles of architectural history and architectural technology respectively. Professor Moriai Yoshio instructed the students from the position of applied geology on vital field survey perspectives, such as how the ground of the stone ruins was created, how stone decline evolved, about the dangers of differential settlement that finally leads to the collapse of archaeological sites, and so on. I have nostalgic memories of the days when I used a helicopter with the professor, in order to explore the five major archaeological sites scattered in the jungles. From survey drawings that inform us of the earlier situation of the ruins to the latest aerial photographs and GPS surveys, Professor Hishida Tetsuro instructed us concerning the significance and role of maps and drawings in archaeological excavation, and especially of the value of using coordinates. Also as a regular staff member of Sophia University there was Professor Arahi Hisao, who gained a doctorate using French from the Catholic University of Louvain (Belgium). An expert in Khmer architectural research, he was studying the changes in the lintel and pilaster decorations, but in 2009 he met with an accident and died a premature death. I was saddened by this, because I had hopes for his future. Professor Aoyagi Yoji (deceased) was an eminent figure in the archaeology of the Philippines, and he contributed to the excavation of an ancient kiln located in Tani village in Cambodia. At that time he was assisted by Professor Sasaki Tatsuo of Kanazawa University. Professor Tabata Yukitsugu has also been involved in excavation at the same Tani kiln ruins, as an expert on research concerning Khmer trade ceramics. Mr. Miwa Satoru has lived in Cambodia for the past 20 years, working as the person locally in charge of the restoration of the Angkor Wat Western Causeway. We also
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