A few suggestions...
You'll probably find the lines drawings, originally part of the Pearson assets during their liquidation and with subsequent ownership becoming more muddled since Pearson never survived, hard to obtain. You might check http://www.pearsoncurrent.com/ as they have a fairly good network of Pearson owners. You can also search for P26 owners groups. If anyone has something, it's likely to be obtained very much earlier and may not have survived well the multi-copying that would have occured in those pre-scanner days. Jack
