यो Presentation आफ्नो भाषा मा अवस्थित छैन, हेर्नुहोस्: English (en),
अथवा गुगल अनुवाद प्रयोग:  

 

Presented By: Roland Bunch

Event: ECHO East Africa Highlands Symposium 2014 (2014-10-27)

A-frame levels can be used to trace contour lines for soil conservation, or irrigation ditches at ½ % slope. They are highly accurate, and cost nothing.

 

क्षेत्र

East Africa