The program was launched on June 5, 1963, and the FAA estimated that by 1990 there would be a market for 500 SSTs.
(on the Gothic revival of the 19th century and the depictions of Gothic cathedrals in the Arts)* Tonazzi, Pascal (2007) "Florilège de Notre-Dame de Paris (anthologie)", Editions Arléa, Paris, ISBN 257895462== Zunanje povezave ==* Mapping Gothic France, a project by Columbia University and Vassar College with a database of images, 360° panoramas, texts, charts and historical maps* Gothic Architecture Encyclopædia Britannica* Gutenberg.org, from Project Gutenberg* , Archive.org, from Internet Archive