From: jfb@ihlpl.att.com (Joseph F Baugher)

These articles are a series which will discuss the  US  Army
and  US  Air Force fighter aircraft in the P (later F) series.  I will
discuss them in the order  in  which  they  appear  in  the  numerical
series.  

 p1: The Curtiss P-1 Hawk
 p2: The Curtiss P-2 Hawk
 p3: The Curtiss P-3 Hawk
 p4: The Boeing XP-4
 p5: The Curtiss P-5 "Superhawk"
 p6: The Curtiss P-6 Hawk
 p7: The Boeing XP-7
 p8: The Boeing XP-8
 p9: The Boeing XP-9
p10: The Curtiss XP-10
p11: The Curtiss XP-11 Hawk
p12: The Boeing P-12
p13: The Thomas-Morse XP-13 Viper
p14: The Curtiss XP-14
p15: The Boeing XP-15
p16: The Berliner-Joyce P-16
p17: The Curtiss XP-17
p18: TheCurtiss XP-18
p19: The Curtiss XP-19
p20: The Curtiss YP-20
p21: The Curtiss XP-21
p23: The Curtiss XP-23
p24: The Lockheed-Detroit YP-24
p25: The Consolidated Y1P-25
p26: The Boeing P-26
p27: The Consolidated YP-27
p28: The Consolidated YP-28
p29: The Boeing YP-29
p30: The Consolidated P-30
p31: The Curtiss XP-31 Swift
p32: the Boeing XP-32
p33: The Consolidated XP-33
p34: The Wedell-Williams XP-34
p35: The Seversky P-35
p36: The Curtiss P-36 Hawk
p37: The Curtiss YP-37
p38: The Lockheed P-38 Lightning
p39: The Bell P-39 Airacobra
p40: The Curtiss P-40 
p41: The Seversky/Republic XP-41
p42: The Curtiss XP-42
p43: The Republic P-43 Lancer
p44: The Republic XP-44 Rocket
p45: The Bell P-45 Airacobra
p46: The Curtiss XP-46
p47: The Republic P-47 Thunderbolt
p48: The Douglas XP-48
p49: The Lockheed XP-49
p50: The Grumman XP-50
p51: The North American P-51 Mustang
p52: The Bell XP-52
p53: The Curtiss XP-53
p54: The Vultee XP-54
p55: The Curtiss XP-55 Ascender
p56: The Northrop XP-56 "Black Bullet"
p57: The Tucker XP-57
P58: The Lockheed XP-58
P59: The Bell P-59 Airacomet
P60: The Curtiss P-60
P61: The Northrop P-61 Black Widow 
P62: The Curtiss XP-62
P63: The Bell P-63 Kingcobra
P64: The North American P-64
P65: The Grumman XP-65
P66: The Vultee P-66 Vanguard
P67: The McDonnell XP-67 Bat
P68: The Vultee XP-68 Tornado
P69: The Republic XP-69
P70: The Douglas P-70 Nighthawk
P71: The Curtiss XP-71
P72: The Republic XP-72
P73: The "P-73"
P74: The "P-74"
P75: The Fisher P-75 Eagle
PW9: The Boeing PW-9