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Here's a fun one. I came across a declassified report referencing North Korea's first known facility to produce liquid propellants, near Manpo-up. Analysts judged the plant produced hydrogen peroxide. 
I downloaded a declassified KH-9 satellite image of the place toward the end of construction in 1974 -- although there is a cloud over part of the facility. Still, what a lovely image.
Hydrogen peroxide has its uses in rocketry, but it's not part of common propellant combinations today. North Korea eventually imported Scuds that use RP-1/RFNA, then moved on to using UDMH/NTO. So I wondered whether this site is, or ever was, relevant.
hydrogen-peroxide.us/history-US-Gen…
hydrogen-peroxide.us/history-US-Gen…
