In the villages, revenue surveys were conducted. The effort was to kno

1.	In the villages, revenue surveys were conducted. The effort was to know the topography, the soil quality, the flora the fauna, the local histories and the cropping pattern-all the facts seen as necessary to know about to administer the region. From the end of nineteenth century, Census operations were held every ten years.a- Why was survey necessary?b-When was last Census operation held?c- Define the term topography.
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