Yazar
Guanghong Yan
2 cilt bulundu.
Cilt sonuçları
Zen yang gao hao yi hu cheng bao zhi li xiao liu yu
Guanghong Yan · Sine nomine
173 sayfa · 1985
Agricultural productivity / Economic aspects / Economic aspects of Soil conservation / Economic aspects of Water conservation / Farm production quotas
怎样搞好以戶承包治理小流域
Guanghong Yan, Yi Liu, Boyuan Sun · Shanxi ren min chu ban she
173 sayfa · 1985
Agricultural productivity / Farm production quotas / Soil conservation / Economic aspects / Water conservation