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Bureau of Mines / Minerals yearbook 1990
Year 1990, Volume 2 (1990)

Prosser, L. J., Jr.
Maryland,   pp. [240]-245 PDF (728.1 KB)


Page [240]

LEGEND 
State boundary 
——— County boundary 
0 Capital 
. City ~ed st~&und 
a gravel districts 
MINERAL SYMBOLS 
 Al Aluminum plant CC-Sh Common Clay a Shale 
£!~ Cement ~ cs Crust~eci Stone 
~ Copper~ D.G Dimension Granite D.S ~ Sandstone Is Industrial Sand 
pest Peat 
 so Sand and Gravel 
!!!!! Iron and Steel ~ 
~ Concentration of s.'— __~, àilneral operations 
Principal Mineral-Producing LocalitiesMARYLAND 


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