Some of the RL 8 are available on Microfiche or roll.
But recently I had the case, that I did to got the roll, because there were also informations on it, that were not for public use, so I got the original file.
Selke has now a homepage:
www.selke-gmbh.de (Only in German)
Under Kontakt you can see some E-Mail addresses.
But I´m not sure, if they accept orders via E-mail.
Dirk