Historial Racial/Religious restriction research

[naraht]

Does anyone have any suggestions on research materials on the various *official* racial and religious membership restrictions for the various NIC, NPC and NPHC fraternities.

For example: Did Alpha Tau Omega ever require that members be Christian? If so, when did that end. Did it ever require that members be Northern European? If so, when did that end and did it expand to allowing all Europeans first?

If there wasn't a written policy, was it known but unwritten?

I'm not specifically looking for Alpha Tau Omega, but on all of the NIC/NPC/NPHC. However, someone has to have done this research before, right?

Randy