I don't know if this is old news or not, but I know a lot of us are always searching for technical documentation on broadcast transmitters and other equipment, manuals, catalogs, etc - and this site was a new one for me:
http://louise.hallikainen.org/BroadcastHistory/index.php/HomePageLots of interesting historical links and links to other resoures, as well. Some rare stuff here!
73, Bob W9RAN