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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