How to Plot CONTOURS on a SURVEY PLAN with REDUCED LEVEL(R.L.) Points/ Interpolation of CONTOURS

An Introduction to Final Survey Site Plan or Map Production (Land Surveying): https://amzn.to/3mja9sN

Plotting contours manually on paper when you already have reduced level points from the site survey.
How to make contour lines with the given reduced level points.
How to make freehand contour lines on a survey plan.

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