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"Sound Barrier ," a tutorial from the "Sonic Boom, Sound Barrier, and Condensation Clouds " (or "Sonic Boom, Sound Barrier, and Prandtl-Glauert Condensation Clouds") collection of tutorials by Mark S. Cramer, Ph.D. at http://FluidMech.net  (Tutorials, Sound Barrier).

"Breaking the Sound Barrier with an Aircraft " by Carl Rod Nave, Ph.D. at http://HyperPhysics.phy-astr.gsu.edu  (Sound).

" " a video of a concorde reaching mach 1 at intersection TESGO taken from below.