Here are Scribd's for 3 of the 4 other books he mentioned. Can anyone produce better links?

http://www.scribd.com/doc/139749115/1-Arithmetic-for-the-Pra...

http://www.scribd.com/doc/88264564/Algebra-for-the-Practical...

http://www.scribd.com/doc/88269362/Trigonometry-for-the-Prac...

I can't find one for Geometry for the Practical Man

Look for, "Geometry for the Practical Worker" the series title has been updated.

Rather it was the one he taught him self calculus with as a pre-teen.