cover --, 1929-31, Wilkins Antarctic Expeditions, six cacheted covers, incl. one 1929-30 Deception Island cover (Falklands and Uruguay joint franking), others are registered Wilkins-Ellsworth Trans-Antarctic Submarine Expedition covers with U.S. and G.B. or Norway joint frankings, all have Hubert Wilkins autograph signatures, first cover has light paper clip stain, others very fine