| 11. | Historical maps mark the location of Ballyduff Castle in ruins.
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| 12. | For further icons and legend conventions, see Historical maps conventions.
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| 13. | Many of the Collection's historical maps have been digitized and are freely available online.
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| 14. | Listed in order of publication date | " Reference : David Rumsey Historical Map Collection"
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| 15. | The position of the frazione is attested by some historical maps since the seventeenth century.
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| 16. | Some of the earliest records of the development of the area is the historical maps.
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| 17. | :: There are several academic historical maps of China.
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| 18. | It also features historical maps, movies, photos and articles.
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| 19. | Since for example Germantown is part of Philadelphia today, a historical map would be ideal.
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| 20. | For historical maps a very serious historical, geographical and topological researches have to be done.
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