@book{https://resolver.caltech.edu/CaltechAUTHORS:20140430-082602227,
    title = "Frontiers in Space: Official Publication of the Mount Wilson and Palomar Observatories",
    year = "1950",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20140430-082602227",
    id = "record"
}