The H. Otley Beyer Map Collection consists primarily of maps collected by Beyer of the Philippines. The collection includes rainfall, topographic, land-use, language groups, ethnic groups, geological maps and road maps. There are a small number of manuscript maps about ethnic groups and language groups of the Philippines, as well as tektite sites, some of which were authored by Beyer. In addition, a small number of maps have been kept with the Beyer manuscript collection (Papers of H. Otley Beyer, 1850-1964, MS 4877).