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Bulgaria 1968 - 80th Anniv of Sofia Zoo
1819
1820
1821
1822
1823
1824
Bulgaria 1968 - Insects
1826
1827
1828
1829
1830
Bulgaria 1968 - "Co-operation with Scandinavia"
1831
Bulgaria 1968 - Srebirna Wildlife Reservation. Birds.
1836
1837
1838
1839
1840
1841