The old CAR's and CAM's are online at:
http://specialcollections.tasc.dot.gov/?submit1=Continue
Early versions of FAR 23 also had simplified flap loadings in Appendix A:
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgFAR.nsf/MainFrame?OpenFrameSet
The info you seek is on the net, at the NACA report server. You need to be persistent and subtle when you search.
NACA Report 824
Summary of Airfoil Data
The 64sub2-415 is on page 449 - the same graph that is reproduced in the book by the same authors...