Although the author merely speculates about this airplane's existence, he gives you an detailed insight into the history of developement of secret supersonic planes and the way US black projects work. 100 pages, no OCR but readable, some rare photos of other secret spyplanes which have been disclosed so far.

From a web review:
Bill Sweetman, North American editor for Jane's Defence Weekly, gathers the available shreds of evidence that substantiate the existence of a spyplane called the Aurora--a plane whose existence is denied by the US Air Force.

Sweetman.-.Aurora.-.The.Pentagon's.Secret.Hypersonic.Spyplane.(1993).®.pdf 0 clicks