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Historic Map Works is an online gallery of hundreds of historical maps. On Historic Map Works you can browse for maps by continent, country, state, and province. Contrary to my initial experience, downloading the map images is not free. But, you can view more than half of the maps as Google Maps overlays using Historic Map Works's free Historic Earth Basic.

Search Tips 1. Keep it short. Think about the doc, what would the writer say? How would they talk about it? Try to match what will appear. 2. State the answer. Instead of "When was the plane crash" Write "The plane crashed on. . . " 3. Use unique words in search 4. Look at more than one result, don't just pick the first link. Browse the entire page of results. 5. Pay attention to the "Did you mean. . . "