Beautiful color-coded/shaded diagram depicting expected(?) X-15 aerodynamic heating temperatures. Wind-tunnel, slide-rule, raw brain-power & common sense-derived data I'd assume.
Also:
history.nasa.gov/x15conf/history.html
history.nasa.gov/x15conf/ihi-24.jpg
On a slick high-gloss photo paper that has the feel of photo film, but thick. Upper left border bears "ANSCO SAFETY FILM 4". It even has a small precise notch in the lower right...sort of like old school camera film.
