http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Episode 237 - Sky Crane: In 1964 a unique new helicopter flew for the first time before a group of military planners. It would go on to be called the Sky Crane and is still in use today. It was designed with a skeletal frame so that it could carry heavy loads held in place beneath its airframe rather than hanging from a cable.
Title from resource description page (viewed May 13, 2019).