This is probably work by Plowman, Craven and Associates relating to their survey of March 1990 and the resulting sheet of sections MP/DER0244, but no maker is credited on the sketch.
This is part of the Job: PF/DER/007 Labelled sheets and working sketches from a topographic site survey; within the Volume: PF/DER Derwentcote Steel Furnace, Derwentcote, County Durham; within the Series: EHC01/022 English Heritage Plans and Measured Drawings; within the Collection: EHC01 English Heritage(EH):Archive
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