Ann Marie:
 
Here are some PPG references for you:
 
Noninvasive Techniques in Vascular Disease, 3rd Edition; Eugene F. Bernstein (Editor); C.V. Mosby Company (New York)
(I believe there is now a 4th edition)
 
Noninvasive Diagnostics in Vascular Disease; Arnost Fronek; McGraw Hill (St. Louis)
 
Vascular Laboratory Policies & Procedures; Rumwell, McPharlin, Strandess, Grant (Editors); Davies Publishing (Pasadena, CA)
 
I hope this helps.
 
Regards,
 
Bob Smith
EDI