If you haven't come upon the link before you may like:
http://ne1h.com/Rohn25GFoldOverManual.pdf
It is the manual from 1978 for the folding tower you mentioned. Back then they made both a series 25 and series 45 version (they now only make the 45 series). What is especially interesting is the 'parts list' has the prices written in the margins. The 48' 25 series was over $700 even back then.