The first major archaeological project in the Philippines was the Rizal-Bulacan Archaeological Survey (1926–1930), prompted by the discovery of finds during the construction of the Novaliches Dam in Rizal Province. Beyer opened substantial excavations in the area of the dam, employing up to seventy workers a day for six months. He also conducted a five-year survey of the surrounding area, cataloguing 120 sites and nearly 500,000 artefacts. In 1932, Beyer assisted F. G. Roth in beginning a second major project, the Batangas Archaeological Survey, which involved surveys and excavation in the Cuenca region. He also collected material from a number of localities around the islands throughout the 1930s and early 1940s.
