Tinkertoys
Here are reprints of the pages of the Tinkertoy instruction manual found in sets in the 1960s.
These are rare to find today as kids would stuff them back in the tube with the parts and they would get tattered and ruined.
I scanned these from a set that came with a very well preserved booklet, and scanned for your enjoyment. I would recommend dropping them into Word and printing each page at 120% size, at best resolution. You will notice that many of the scans include some edges of the next or previous page. Simply cut these away, using an inexpensive slide cutter from a place such as Staples.