Bui. 1419, U. S. Dept. of Agriculture 
Plate 7 
Km- j«J?.w.. . 
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Subsidence of Forests and Highways on Peat Land with an Un- 
stable Structural Framework 
A, Swamp forest which emerged after the trees had died; B, roadbed sinking into water 
pockets (photographed by H. R. Sayre); C, upheaved layers of peat along a sinking high- 
way (photographed by W. E. Tharp) 
