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From the early 60's until 1990, the Appalachian, Pioneer, and Gulf Coast Leagues import as short-season A level, B & C level leagues. In '91 they start importing as Rookie (D&E) leagues.
Baseball Reference lists them as Rookie level leagues for the earlier time period. I'm not sure if they're importing at the B&C level is intended rather than the D&E level. Thought I'd mention it.
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