Donation of Blood and Blood Transfusion 38
First day cover from Denmark postmarked January 24, 1974. Giv Blod! Red liv! First day cover from Belgium postmarked 1971. Anniversaire Verjaring "Ondekking van de Insuline" "Decouverte de L'insuline"
Postage-stamp albums, Stamp collecting, First day covers (Philately), Denmark, Belgium