E.R.P.S.'s detailed response to the FAA NPRM for Reusable Rocket Vehicle licensing.
We were the only amateur group to respond and were quoted in several places in the Final Rule.
A Single Stage To Orbit Rocket with Non-Cryogenic Propellants
This is the paper that started E.R.P.S. - Mitchell Burnside-Clapp's high density propellant paper from Makin' Orbit '93.