The first chapter to install is listed as the first, no matter whether NPHC or NPC. As in the case of SUNY campuses and others where the system closed down, the original one that pioneered is listed, and then when the campus re-opened the first to re-install is listed as another first. In many cases, several groups installed the same year but I tried to find the one that actually installed their chapter first. There maybe as many as 20 cases when that could not be determined, and in that case more than one group is listed. As in every study or poll, there is a margin of error of some minor percent but I doubt that any group is off by more than one or at most two. Believe me, it wasn't an easy task but we have the actual date of nearly 90% of the first charterings.
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