The history of the U.S. National Parks system, including the initial ideas which led to the world's first national parks and the expansion of the system over 150 years.
The richest patrimony。家园 ——《美国国家公园全纪录》观后感。印象最深刻的两段话！。http://www.bilibili.com/video/av10011851/。第六集结尾自译。第二集结尾自译。有人毁坏它也必将有人成就它。美国国家公园全纪录第十集读后感。纪源观影：北美国家公园全纪录。观后感。
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