The Historical past of Rotary Wings: Hundred Years of Achievements Advised By way of Philately
As a celebration of hundred years of vertical flight, 1907-2007, the writer has described the evolution of rotary wing machines, from which helicopters are the end result. This guide illustrates the five-frame topical philatelic exhibit (80 pages) telling this story in displaying all of the stamps which were issued all through the world till 2007.
