Aquatic Birds (1973) design type (#13852)

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Mongolia 8/10/1973 5m d=Tadorna tadorna (1973) perf=12x11.25

Mongolia 8/10/1973 10m d=Gavia arctica perf=12x11.25

Mongolia 8/10/1973 15m d=Anser indicus (1973) perf=12x11.25

Mongolia 8/10/1973 30m d=Podiceps cristatus (1973 Mongolia) perf=12x11.25

Mongolia 8/10/1973 50m d=Anas platyrhynchos (1973) perf=12x11.25

Mongolia 8/10/1973 60m d=Cygnus olor (1973) perf=12x11.25

Mongolia 8/10/1973 1t d=Aythya marila (1973) perf=12x11.25