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What do a.m. and p.m. stand for?

great soil group

noun
1.
according to a system of classification that originated in Russia, any of several broad groups of soils with common characteristics usually associated with particular climates and vegetation types.
Origin of great soil group
1935-1940
1935-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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6
7
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