The New Encyclopaedia Britannica
Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries - 934 pages
 Propaedia: outline of knowledge and guide to the Britannica.--- Micropaedia: ready reference and index.--- Macropaedia: knowledge in depth.
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Its average content in soils and rocks of the earth's crust is 0.12 percent, whereas
that of iron is 5 percent, of calcium 3.6 percent, of potassium 2.6 percent, and of
magnesium 2.1 percent. Thus, when phosphorus is removed from the soil by ...
Less than 30 percent of the country's total land area is wooded and, of this, some
80 percent is occupied by coniferous ... By the early 1970s agriculture produced
less than 20 percent of the national income and employed 35 percent of the ...
About 1 1 percent of the population of the United States is Negro. These North
American Negroes have about 20 percent of European genes, while the
percentage of Negro genes in the white population is negligible. In the West
Indies, the ...
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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