This Document that I found trougth by the finder before explained, must be very useful and interesting:
Bombing the European Axis Powers
...byproducts of great value to the German war economy. By September...Ludwigshafen plants deprived the Germans of 63 percent of their synthetic...sent an equal amount against tank production. High German losses in armored fighting...Allies to conclude that the Germans were desperately short of...the Germans sent finished tanks to the front within a month of completion...

http://aupress.maxwell.af.mil/Books/Davis_B99/Davis_B99.pdf

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La llave de la libertad es la sabiduria. El cerrojo de la esclavitud la ignorancia

U-Historia, Ubootwaffe 1939-1945 History of UBootwaffe in Spanish
http://www.tradiweb.com/ta.htm Translator Web
http://www.forospyware.com In Spanish