There are 86 P&R images in the Hagley Digital Archives:

"This collection consists of photographs that detail the steps of mining and processing anthracite coal. The Philadelphia and Reading Coal and Iron Company was the country's largest producer of anthracite coal from 1871 through the 1920s. This collection primarily shows the company's operation in Locust Summit near Mount Carmel, Pennsylvania."

http://digital.hagley.org/cdm4/browse.php?CISOROOT=/p268001coll24&CISOSTART=1,1

The rest of the collection can be accessed at:

http://digital.hagley.org/index.php

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-Thou shalt not little vein-