Specific References:

WW II Archives --- U-Boat Intercepts- Type in the U-boat in question in the top right "Search Box".....
Marhst_L ListServe Index --- Maritime Archives Search Sample - "U-Boats"
"The Northern Mariner" --- Ex. 1: Type in "Convoy" (withot quotes) into the top right search box.
  (
Index listing 1991 - 2006) -
       (most recent index listing to 2010) -
Sea Classics --- Magazine Articles From 2004 to 2011 -
The Naval Review Archive --- World War II Pertinent Articles
Out Of Copyright Books - Downloadable Books
International Journal Of Naval History - Search
There is a great source for Kriegsmarine Grid Maps (Quadkarte) here - The links below are in sequential order - left to right:
                   
             - A sample map is here
An important source for "English translated" WW II U-Boat KTB's and related KTB info (check also the bottom of this page for additional information) -
WW II U-Boat Bunker Links --
Find A Grave (Marker) Moltenort U-Boat Memorial -

German-American Definitions/Abbreviations -     

German Military Dictionary     German Military Abbreviations

Rob Fisher's Canadian Naval History Site - Naval Articles Pertaining To The Atlantic War -
Angelray Books "Archived" Kriegsmarine/U-Boat Page - VERY Informative
Reports Of The Post WW II Naval Technical Missions To Europe & Japan - Detailed Information
ULTRA and the Battle of the Atlantic - Vols. I, II, III, IV (NO Vol.V) And Appendices
Mike Kemble's War At Sea Articles
A wealth of information regarding records research is located here
World War II Operational Record Collection
A wealth of information regarding WW II records is located here
 

Go directly to the "Downloads" directory.....