http://airfoiltools.com/

Hi Dear Daouglas

You could use " Plot Digitizer " software to digitize any kinds of plot. Working with this soft ware is extremely easy. first you open the image file in it. then you calibrate the plot  to show max and min value for X and Y coordinate. then you select the points on the plot and save the text file for it. You could download this software from University of South Alabama, Department of Physics site by this address.

http://www.southalabama.edu/colleges/artsandsci/physics/software.html

Good Luck :)

Thanks Guys,

It looks like their book is based on data from NACA TR 824, which someone has digitized. Here is a link to NACA TR 824:

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090976.pdf

I've attached a zip file with the digitized data in it that I found on Xplane.org. Here is a link to the post on Xplane if you're interested: http://forums.x-plane.org/index.php?app=downloads&showfile=2538

Once you open the zip file, there is a Readme.txt file that explains how the data is formatted.

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090976.pdf

http://forums.x-plane.org/index.php?app=downloads&showfile=2538