Jelle:
Just solved your "no credit card" problem; you can download the books here. They are complete!
United States Army in World War II - The Corps of Engineers: Troops and Equipment
http://www.usace.army.mil/publications/misc/un21/toc.htm
United States Army in World War II - The Corps of Engineers: Construction in the United States
http://www.usace.army.mil/publications/misc/un20/toc.htm
The Corps of Engineers: The War Against Germany - They don't have this one uploaded yet. Sorry!
Ah, but wait, here is another site. Try downloading the ZIP file entitled, Set-5-Disk-1.zip It can be found here. I am downloading it myself to see if it works.
http://www.ibiblio.org/pha/USA-in-WWII/Set-5-of-7/
Good luck. This way you can have it all on your computer. That might work just fine!!!
Proud Daughter of Walter (Monday) Poniedzialek
540th Engineer Combat Regiment, 2833rd Bn, H&S Co, 4th Platoon
There's "No Bridge Too Far"