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1 American Memory - Map Collections - Cities and Towns 开放资源 机器抓取
  The Cities and Towns map collection, part of the Library of Congress American Memory series of online historical collections, includes cartographic items illustrating significant u...
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2 American Memory - Map Collections - Discovery and Exploration 开放资源 机器抓取
  The Discovery and Exploration map collection, part of the Library of Congress American Memory series of online historical collections, consists of both manuscript and published map...
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3 Digital Atlas of The United States 开放资源 机器抓取
  The Digital Atlas of the United States is a continuing public education project of Professor William Bowen and the Department of Geography at California State University, Northridg...
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4 Ground Water Atlas of the United States 开放资源 机器抓取
  This site gives access to the national ground water Atlas of the USA. The atlas describes in 13 chapters the ground-water resources of regional areas that collectively cover the 50...
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5 Harvard Map Collection 开放资源 机器抓取
  The Harvard Map Collection is one of the largest and oldest map collections in America. The collection has grown to include ca. 400,000 maps, over 6,000 atlases, and several thousa...
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6 USGS Topographic Maps 开放资源 机器抓取
  该站点介绍了美国地质勘探局(USGS)地形图集,这些美国地形图可以在线浏览、购买和下载(需要收费)。包括USGS地形图在内的数据资源主要是1:2.4万,1:10万,1:25万几种比例尺的地形图。;The U.S. Geological Survey (USGS) produced its first topographic map in 1879, the ...
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7 Weeds of the Northern Blackland Prairie 开放资源 机器抓取
  In the site, you will find a growing collection of photographs and identification information for weeds commonly found in Blackland Prairie. Use the weed selector below to view the...
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