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http://history.nasa.gov/monograph31.pdf
Alas, the pdf's size is 1.1 mb, the limit is just under 1 mb, so, link only.
But what a link.
(I attached the text copy of it, why not.)
"AMERICAN X-VEHICLES
Centennial of Flight Edition
SP-2003-4531
An Inventory—X-1 to X-50
by Dennis R. Jenkins, Tony Landis, and Jay Miller
Monographs in Aerospace History No. 31
June 2003"