USA 1957-77 group of 8 Arctic covers with scientific research related cachets, mostly pictorial (polar bears, sattelite stations). Noted Point Barrow, Alaska "Top of the World" (2 diff), Fletcher's Ice Island (83°N) x 2 diff, Ice Patrol Oceanographic Survey, NASA STDN Station. Also 2 Canadian Arctic & greeting card (glacier) c1970. Ex Brodie. Fine (11 items).