@other{https://resolver.caltech.edu/CaltechTHESIS:10152024-223942740,
    title = "The Development of a More Precise Cosmic Ray Sounding Balloon Electroscope and Some Preliminary Results",
    year = "1936",
    url = "https://resolver.caltech.edu/CaltechTHESIS:10152024-223942740",
    id = "record",
    doi = "10.7907/fn18-1z28"
}


@other{https://resolver.caltech.edu/CaltechETD:etd-08262008-131641,
    title = "Gamma Ray Ionization in Several Gases as a Function of Pressure and Collecting Field",
    year = "1933",
    url = "https://resolver.caltech.edu/CaltechETD:etd-08262008-131641",
    id = "record",
    doi = "10.7907/6GXX-G222"
}


@other{https://resolver.caltech.edu/CaltechTHESIS:03092011-115217519,
    title = "The Absorption Coefficient of Hard Gamma-Rays",
    year = "1930",
    url = "https://resolver.caltech.edu/CaltechTHESIS:03092011-115217519",
    id = "record",
    doi = "10.7907/ZG7Q-QN03"
}