The Purple Martins of Mason-Dixon Historicall Park: This blog will document the Purple Martins arrival, nesting, hatching, development of brood and departure annually, as the Purple martins make Mason-Dixon Historical Park their home from Spring till Fall
250th Anniversary Celebration set for 2017!: "Celebration of the end of the historic Mason-Dixon Line survey"
National Geographic: "Saving the Mason-Dixon Line"
Explore the Line: Scenes, markers and roads from along the western end of the most-famous border in the United States