Field guide of Odonata was available in North India and Peninsular India. Usually, during the field survey some authors were documented only photographs of used expensive camera. And some others were used to collected the specimens by sweep net and Drag net. But the collection methodology was described based on own experience. Some authors describe for ex: it's a pond or wetland area, their take 0.5 km to 1 km surrounding of foot pathway. In additionally, it's linear stream or river, they are take same distance but side foot paths of the stream or river.
I have some experience this kind but they are not published.
I have attach one online available hard copy link below: