The maps in the Map Collections materials were either published prior to 1922, produced by the United States government, or both (see catalogue records that accompany each map for information regarding date of publication and source). The Library of Congress is providing access to these materials for educational and research purposes and is not aware of any U.S. copyright protection (see Title 17 of the United States Code) or any other restrictions in the Map Collection materials.

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	此作品在美國屬於公有領域，因為其是由美國政府的官員或僱員，基於其個人公務目的製作的作品，參考美國法典第17篇第1章第105條。 注意︰本模板僅適用於美國聯邦政府的原創作品，不適用於任何美國州、屬地、聯邦個體、縣、市或任何次級政府的作品。本模板也不適用於1978年以後由美國郵政署出版的郵票圖案（參看美國版權局實踐綱領第313.6(C)(1)條）。也不適用於部分美國硬幣；參看美國鑄幣局使用條款。
此作品無已知的著作權限制，亦不受所有相關和鄰接的權利限制。

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