I count at least 4:
Hicham El Guerrouj - 12:50.24 PR?
Dieter Baumann - 12:54.70
Craig Mottram - 12:55.76
Bob Kennedy - 12:58
The only to arrive at 3 is if you discount Baumann as a doping, or ignore that El G is Caucasian and is not Negroid because he isn't 'Aryan' enough.