@book{https://resolver.caltech.edu/CaltechBOOK:1981.004,
    title = "The Theodore von Kármán Collections at the California Institute of Technology: guide to the original collection and a microfiche edition",
    url = "https://resolver.caltech.edu/CaltechBOOK:1981.004",
    id = "record"
}


@book{https://resolver.caltech.edu/CaltechBook:1977.002,
    title = "The Robert Andrews Millikan collection at the California Institute of Technology : guide to a microfilm edition",
    url = "https://resolver.caltech.edu/CaltechBook:1977.002",
    id = "record"
}