what are all of the stamp sets?
county cricket, 1873-1973, 400th anniversary, birth of inigo jones, 19th commonwealth parliamentary conference, royal wedding (the princess anne), british trees, fire service anniversary, medieval warriors, winston churchill centenary, bicentenary, birth j. m. w. turner, european architectural year, sailing, 150th anniversary of public railways, jane austen bicentenary, social reformers, american bicentenary, roses
what different numbers of cards were issued among those stamp sets?
one, four, three
what was the stamp set to issue three cards?
european architectural year