I have tried and tried in vain to find the music for Salzedo’s edited version of Prokofiev’s Prelude in C online (harp.com, vanderbilt, etc.). I have an old version from my teacher, which is from Leeds Music Corporation but I cannot seem to find the site. I also tried to look on Lyra music but, again, could not find it.
It is not available in print, but the Lawrence edition is the closest to it, and that is available from Lyra. Mainly, some of the left-hand fingerings are different and usable.