Massachusetts Cicadas: May 30 to May 31, 2007 Negative Datapoints of Brood XIII Periodical Cicadas in Southern Michigan

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Negative Datapoints of Brood XIII Periodical Cicadas on May 30 - 31, 2007 in Southern Michigan.
Datapoints as noted by Gerry Bunker of Massachusetts Cicadas

Red pips are positive records
Yellow pips are negative records
Magenta pips are very light occurrences.