If I recall correctly, at one time, PIAA (NFHS) referees worked all of PA, except for the Philadelphia Public and Catholic Leagues (IAABO). Many Philadelphia-based referees belonged to both, so they could work Philadelphia's two strong leagues (the Public and Catholic Leagues) and suburban games. Same uniforms, different patches, obviously.
I may be wrong about this, but I think that since Philadelphia's public (2002) and Catholic (2006) schools have joined PIAA, the IAABO chapter no longer services schools.
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