298
20. Mechanical properties of soils
…………………………………..
155
20.1.
Mechanical properties of soils…………………………………….
155
20.2.
Friction and friction fose in compaction of soils………………..
158
21. Description of engineering -geological places and rocks
………
160
22. Aerial photography and aerial visual observations
……………
165
22.1.
Interpretation features of the
main types of mountain ash
described in aerial photographs…………………………………...
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