1966 - Pulacayo, Bolivia

1970 - San Carlos Youtepec, Mexico

1972 - Cap Chat, Canada

1973 - Loiengalani, Kenya

1980 - Palem, IndiaHAO in collaboration with Southwestern at Memphis College, Tennessee

1981 - Tarma, Siberia, USSRHAO in collaboration with the Astronomical Council of the Academy of Sciences of the USSR, Moscow

1983 - Tanjung Kodok, Indonesia

1988 - Mindanao, PhilippinesIn , Dr. Roberts discusses the High Altitude Observatory (HAO) expedition to the Philippines to observe the