book section published in 1978
book section published in 1980
book section published in 1979
2022 Sky & Telescope article by Peter Schultz and Thomas Dobbins
book section published in 1979
abstract PP43A-01 for the American Geophysical Union, Spring Meeting 2007
book section published in 1980
book section published in 1980
book section published in 1977
book section published in 1981
book section published in 1978
white paper published in 2020
abstract PP33B-10 for the American Geophysical Union, Fall Meeting 2009
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