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Site is the name of the site or area the article relates to.
O&D items in the newsletter are numbered sequentially. Some of the Notes make reference to those numbers (e.g. further info following report in 14).
N/L relates to the newsletter number in which the article appeared. (Not every Newsletter includes an O&D article). N/L and O&D are clickable links to the relevant newsletter PDF, you need to browse that to find the O&D section.
GridDesc is the OS NGR (National Grid Reference) as shown in the original item, sometimes that is a group of NGRs e.g. representing a group of features e.g. "centred SK 188 758"
Notes - the item headline, for further detail see the article
OS NGR is a single grid reference to the approximate location of the item discussed (as distinct from GridDesc). It is a clickable link to a location map on OpenStreetMap.
Coordinates is the latitude & longitude of the item and is a clickable link to a Google map.

Copies of newsletters are held at the PDMHS library in the Lead Mining museum at Matlock Bath.
The index was compiled by Adam Russell and converted to database by Rob Hindle.