Full text: Factors and problems in the selection of peat lands for different uses 

Bul, 1419, U. S. Dept. of Agriculture 
PLATE 3 
VARIETIES OF SEDIMENTARY PEAT 
{. Over shell marl; B. with iron salts; C, with calcium-sulphate crystals; D, algal; 
E. colloidal: F. mixed phase. (All natural size)
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