There's an interesting paper on the above and more at: http://www.navy.mil/navydata/cno/n87/history/wwii-campaigns.html
Now I got some interesting reading for the weekend!

There's a book that that follows the Luftwaffe's bomber usage (and development) year by yeah, mostly reconaissance aircraft and flying boats. Shame that I've only found it in spanish... It's called
Objetivo América, by Manfred Greihl. It's centered on the german plans to bomb the USA, but since thay all failed most of the material is on the use of long-range bombers by the Luftwaffe. It's even got a chapter about mid-air refueling, quite an interesting read! There's blueprints and photos of some stuff that's hard to find. But I mostly recommend this read because it has the transcripts of conversations in the german Air Ministry, like the brilliant moments where heavy bombers where laughed at (those will never affect the way! silly americans

), or when heads of different design bureaus (Messerschmitt, Dornier, Arado) outright called each other names or laughed at the contender's bombers proposals. It really helps understanding germany's failure to manufacture a heavy bomber in 9 years of war!

Now that I checked...I have two copies of this book. Don't ask why, I don't really know! Maybe I'm a bit of an impulsive buyer


Here's one of the interesting illustrations. It shows the range of several bombers, taking off from France.

The range of the Fw-200 goes from 1500 to 2200km, depending on bomb load and extra fuel tanks carried. I believe this map was from 1942, there's some more maps (circa 1943-44) that also show ranges for Ju-290, He-177 and even Me-264 if they were used as reconaissance machines over the Atlantic.
And I'm done with my mighty wall of text...for now!
