This lexicon was compiled by Paul Jen-kuei Li from Naoyoshi Ogawa's unpublished manuscripts/notebooks. There are a total of 5 undated notebooks dating from sometime around the early 1900's. The notebooks are currently held at ILCAA, TUFS, and Nanzan University (Anthropological Institute), all in Japan. In Ogawa & Li (2003), Some data may have also been derived from Dutch sources (missionary tracts, etc.) dating from the mid-1600's.