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It is traditionally assumed that the history of a region begins with its first written
sources, in contrast to prehistory, which ... If ancient times fail to provide the clue
to a certain development, the search for light on the subject must The be directed
Less technical articles on the subject include: H. friedman, "X-ray Astronomy," Sci
. Am. ... the Yalu flows over Precambrian rock (from 570,000,000 to
4,600,000,000 years old) before its alluvium begins to spread out as it
approaches its estuary.
... Africa, Botswana, Rhodesia, and Mozambique — and the use of its waters has
been the subject of a series of international agreements. ... At Cahora-bassa, the
Zambezi begins its descent from the Central African Plateau to the coastal plain.
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LibraryThing ReviewUser Review - keylawk - LibraryThing
This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review