 Route of Highway 78 in 1968, showing the concurrent routing with Hwy 21 from Dresden to Thamesville Excerpt from the 1968 Official Ontario Road Map - Courtesy of Queen's Printer for Ontario - © 1968 |
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 Route of Highway 78 in the 1990s, shortly before the highway was downloaded Excerpt from the 1990 Official Ontario Road Map - Courtesy of Queen's Printer for Ontario - © 1990 |
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