Pat Quinn, Governor

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Explanation of Springfield Map

The map accompanying this directory shows the location of coal mines known to be present in the quadrangle. The map, corresponding to a USGS 7.5-minute quadrangle, covers an area bounded by lines of latitude and longitude 7.5-minutes apart. In Illinois, a quadrangle is approximately 6.5 miles east to west and 8.5 miles north to south, an area of about 56 square miles. The locations of roads and water bodies on the map were obtained from USGS digital line graph files. The ISGS generally offers one map of mines per quadrangle. In some areas, however, extensive mining occurred in two or more overlapping seams. Separate maps are compiled for mines in each seam to maintain the readability of the map for these areas.

Map Interpretation Guide

The guide to interpreting the map is divided into 3 main sections:
  1. Mine Type and Mining Method
  2. Source Maps
  3. Points and Labels

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