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Guano mining in the Central Chinchua (Chincha) Islands, ca. 1860.

Photo of fig 3.1 on page 30 of Glantz, "Currents of Change", which shows Neg. No. 311830 from the American Museum of Natural History. Copyright to image presumed expired; guessing a plausible license.

	这个媒体文件在美国属于公有领域。这适用于版权过期的美国作品，通常因为其首次出版于1929年1月1日之前，或即便当天或以后出版，其并未包含版权通告或获得版权回溯。查看这个页面可以获取到更多的解释。
	这个图片在美国以外可能尚未处于公有领域；尤其在对美国作品不适用较短期限法则的国家和地区，如加拿大、中国大陆（不含香港及澳门）、德国、墨西哥和瑞士。创作者和发表年份是关键信息，因此必须提供。参见维基百科:公有领域及维基百科:版权信息以获取更多细节。

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• (del) (cur) 13:59, 22 January 2006 . . en:User:William_M._Connolley William M. Connolley ( en:User_talk:William_M._Connolley Talk) . . 558x730 (113065 bytes) ( en:Guano Guano mining in the Central Chinchua Islands, ca. 1860. Photo of fig 3.1 on page 30 of Glantz, "Currents of Change", which shows Neg. No. 311830 from the American Museum of Natural History. Copyright to image presumed expired; guessing a plausible li)