Northeastern black soil
the northeastern black soil zone
black soil area in Northeast
the black soil area of Northeast China
Northeastern area of Tarim Basin
northwestern area of China
prospecting in northwestern area
the Northeastern Area of china
the northeastern area of Sichuan
‘black soil type’ degraded grassland
’black soil beach’degraded meadow
’Black soil patch’ degraded meadow
’Black Soil Type’ degraded grasslands
“Black soil type” deteriorated grassland
“black soil type”deteriorated grassland