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Charles Mason (Astronom) – Wikipedia
Wiki box for The Golden Circle proposed borders of the Confederate States of America - essentially if pro-slavery forces got everything they wanted territorially : r/AlternateHistory
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Does the Mason-Dixon Line officially signify any geographic
File:MalariaMap.jpg - Wikipedia
The Mason-Dixon Line: What? Where? And why is it important?
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Liberal Arts Blog — Pennsylvania (Part One): Geography, William
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Linia Masona-Dixona – Wikipedia, wolna encyklopedia
Mason–Dixon line - Wikipedia
Mason–Dixon line - Wikipedia, the free encyclopedia
Transpeninsular Line - Wikipedia