Admiral Byrd Antarctic Expedition 1941 The Snow Cruiser Envelope

This envelope was either sent from or two the Expedition in 1941. It is in excellent condition and has some names in light pencil I cannot make out other Boston mass. What an interesting expedition to try and gain ownership of the antarctic area. The US government funded this in hopes of attaining land. The giant snow cruiser was developed to access the hugh crevasses and edges of the frozen south.