▁R - 2 8 0 0 ; ▁cancel led ▁before ▁conversion . ▁ ▁Spec ifications ▁( X P - 6 0 C ) ▁ ▁See ▁also ▁ ▁References ▁ ▁Notes ▁ ▁Bibli ography ▁▁ ▁Bow ers , ▁Peter ▁M . ▁Curt iss ▁A ircraft , ▁ 1 9 0 7 – 1 9 4 7 . ▁London : ▁Put nam ▁& ▁Company ▁Ltd ., ▁ 1 9 7 9 . ▁. ▁ ▁Dor r , ▁Robert ▁F . ▁and ▁Jon ▁Lake . ▁F igh ters ▁of ▁the ▁United ▁States ▁Air ▁Force . ▁London : ▁Temple ▁Press , ▁ 1 9 9 0 . ▁. ▁ ▁Green , ▁William . ▁War ▁Plan es ▁of ▁the ▁Second ▁World ▁War , ▁Volume ▁Four : ▁F igh ters . ▁London : ▁Mac Donald ▁& ▁Co . ▁( Pub lish ers ) ▁Ltd ., ▁ 1 9 6 1 ▁( S ix th ▁impression ▁ 1 9 6 9 ). ▁. ▁ ▁Green , ▁William ▁and ▁Gordon ▁Sw an borough . ▁W W 2 ▁A ircraft ▁Fact ▁Files : ▁US ▁Army ▁Air ▁Force ▁F igh ters , ▁Part ▁ 1 . ▁London : ▁Mac don ald ▁and ▁Jane ' s ▁Publish ers ▁Ltd ., ▁ 1 9 7 7 . ▁. ▁ ▁Jones , ▁Lloyd ▁S . ▁U . S . ▁F igh ters : ▁ 1 9 2 5 - 1 9 8 0 s . ▁Fall bro ok , ▁California : ▁A ero ▁Publish ers , ▁Inc ., ▁ 1 9 7 5 . ▁. ▁