That's correct about C 10's. And they are C 7's because they are social in nature and have separate Foundations for the C 3 side. Many didn't have C 3's until the late 1900's - after 1950 - so that the C 7 was already up and running for several decades. Also, some have ancillary orgs such as national housing corps which are C 7's except for one that I know for sure is a C 2 - ZTA.
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