1. 
   Do-17
   (from the article `air warfare`) ...though few early World War II bombers would fly this high, the B-17 being the exception.) During the Battle of Britain (July–September 1940), a ...
   Found op http://www.britannica.com/eb/a-z/d/60
   
   
2. 
   Do-217
   (from the article `military aircraft`) ...fast, with a top speed of 280 miles per hour, but it carried a modest bombload; the other German bombers had mediocre performance and were lightly ...
   Found op http://www.britannica.com/eb/a-z/d/60
   
   
3. 
   Dornier Do 17
   The Dornier Do 17 was a German four-seater medium bomber of the Second World War. It was powered by two Bramo 323P Fafnir 9-cylinder radial piston engines giving it a top speed of 410 kmh and a range of 1160 km. Armaments consisted of up to seven 7.92 mm MG 15 machine-guns and 1000 kg of bombs
   Found op http://www.probertencyclopaedia.com/browse/ID.HTM
   
   
4. 
   Dornier Do 217
   The Dornier Do 217 was a German four-seat medium bomber of the Second World War, first flown in 1938, and developed as an enlarged Dornier Do 17. Various versions were built, the Do 217A reconnaissance aircraft which entered service in 1940; the Do 217C and later Do 217E bomber variants, the Do 217E...
   Found op http://www.probertencyclopaedia.com/browse/ID.HTM
   
   

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