[WVMnteer]

That was true in 1978 maybe.

The Cowboys line (which is good as it should be considering the resources they poured into it) comes from these colleges:

USC
LSU
Wisconsin
Notre Dame
Florida

I’m fairly certain that everyone scouts those five schools.

[Alberta's Child]

Right -- but I was thinking even later than the 1970s.

The Cowboys of the 1992-95 period that won three Super Bowls in four years had 15 different offensive linemen on their roster. Here were the places where they played college ball (roughly in order of the school's reputation for its NCAA football program):

UCLA
Washington
Pittsburgh
North Carolina State
Boston College
Temple
UNLV
Tulane
Nevada
Florida A&M
Hawaii
East Texas State
Sacramento State
Sonoma State
Central State (Ohio)

Those are some pretty obscure schools there, for sure. I never even heard of the last four on that list.