Listen to the episode -- An Airlock Is Discovered
Volume Number: 1
Episode Count: 130
Catalog #: CH-MGIS-1

Some sources indicated the series was first heard during the 1930s, but The Radio Showbook of 1945 lists 130 episodes also available to local stations that year.
The story line revolved around the adventures of a shipwrecked girl named Joan Gregory and her friend Jerry Hall.
Their magic South Seas island had the ability to appear and disappear at a scientist's command.