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Survey maps are based on on-the-ground measurements and observations and constitute the raw data from which more elaborate printed or manuscript maps are made. Often, survey maps were prepared in order to determine the exact size and shape of a piece of land in order to sell or purchase it. Image: detail from Hezekiah Veatch, Map of military lots, tracts, patents, etc. in western Allegany and Garrett Counties, Maryland, [1787?]