1991-10-12: Monkeys

1991-10-12: Paintings 1991

1991-09-02: General De Gaulle

1991-09-02: Celebrities and International Organizations

1991-08-31: Butterflies (1991)

1991-08-23: Cars and Space

1991-08-17: Postage Stamp Centenary

1991-08-13: 30th Anniversary of Amnesty International

1991-08-08: Ducks

1991-07-02: Insects 1991

1991-06-30: Water conservation

1991-06-29: World Telecommunications Exhibition "Telecom 91" - Geneva

1991-06-08: Scouts, Butterflies and Fungi

1991-06-08: Winter Olympic Games 1992 - Albertville (II)

1991-06-06: Centenary of the construction of the Trans-Siberian

1991-05-30: 500th anniversary of the discovery of America

1991-05-13: Allegory : Introduction of Airmail Service

1991-04-15: Tourism 1991

1991-04-10: Locomotives 1991

1991-03-25: Mushrooms 1991

1991-01-30: Medicinal Plants

1991-01-10: 10th Anniversary U.P.A.P.