cover 1930-31 selection of "Graf Zeppelin" covers (4) comprising 1930 (28.4) Swiss flight bearing Austria 15g. (6), 30g. and 50g., (20.8) Copenhagen flight cover bearing Liechtenstein 25rp., 35rp. and 1f. (2), 1931 (July) North Pole Flight covers (2), one bearing Netherlands 2½c., 20c., 27½c. pair and 40c., the other bearing Austrian adhesives (11)