By stating 'in print and available' I am assuming you mean a hard copy. If you want a digitized version, you can have one free by going here:

http://digital.library.umsystem.edu/cgi/t/text/pageviewer-idx?c=umlib;cc=umlib;sid=90fb979ca5e98d74ed0b8d12a5b28c14;q1=A.W.M.%20Petty;op2=near;op3=near;rgn=full%20text;amt2=40;amt3=40;idno=umlr000067;view=image;seq=1