Including the non-governmental organisation of experts committed to expanding the frontiers of space, what were the other two societies Loeb was elected fellow of?
International Academy of Astronautics The International Academy of Astronautics (IAA) is a non-governmental organisation of experts committed to expanding the frontiers of space. It was established in Stockholm (Sweden) on August 16, 1960.
Linnean Medal The Linnean Medal of the Linnean Society of London was established in 1888, and is awarded annually to alternately a botanist or a zoologist or (as has been common since 1958) to one of each in the same year. The medal was of gold until 1976, and is for the preceding years often referred to as "the Gold Medal of the Linnean Society", not to be confused with the official Linnean Gold Medal which is seldom awarded.