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Ellsworth, Lincoln

(Encyclopedia)Ellsworth, Lincoln, 1880–1951, American explorer, b. Chicago, Ill. He was a surveyor and engineer in railroad building and later a prospector and mining engineer in NW Canada. He became the financia...

Tlingit

(Encyclopedia)Tlingit tlĭngˈgĭt [key], group of related Native North American tribes, speaking a language that forms a branch of the Nadene linguistic stock (see Native American languages). The 14 divisions of t...

sharecropping

(Encyclopedia)sharecropping, an agricultural system in which a landowner allows a tenant to use their land in return for a share of the crop produced. In the United S...

timberline

(Encyclopedia)timberline, elevation above which trees cannot grow. Its location is influenced by the various factors that determine temperature, including latitude, prevailing wind directions, and exposure to sunli...

Yukon, river, Canada and the United States

(Encyclopedia)Yukon yo͞oˈkŏn [key], river, c.2,000 mi (3,220 km) long, rising in Atlin Lake, NW British Columbia, Canada, and receiving numerous headwater streams; one of the longest rivers of North America. It ...

Bering, Vitus Jonassen

(Encyclopedia)Bering, Vitus Jonassen vēˈto͝os yōˈnäsən bārˈĭng [key], 1681–1741, Danish explorer in Russian employ. In 1725 he was selected by Peter I to explore far NE Siberia. Having finally moved men...

Queen Charlotte Islands

(Encyclopedia)Queen Charlotte Islands, archipelago of several large and many small islands, off the coast of W British Columbia, Canada. The main islands are Graham and Moresby. Masset on Graham Island is the main ...

National Forest System

(Encyclopedia)National Forest System, federally owned reserves, c.191 million acres (77.4 million hectares), administered by the Forest Service of the U.S. Dept. of Agriculture. The system is made up of 155 nationa...

heath, tract of open land

(Encyclopedia)heath, tract of open land characterized by a few scattered trees, abundant moss cover, and numerous low shrubs, principally of the heath family (see heath, in botany). In high-latitude regions with mi...

acre, measure of land area

(Encyclopedia)acre, measure of land area used in the English units of measurement. The acre was originally the area a yoke of oxen could plow in a day and therefore differed in size from one locality to another. It...