The collection of 19 maps issued by the Pennsylvania Bureau of Mines details both the anthracite and bituminous coal fields of Pennsylvania in great detail.

Reflected in this collection is the bureaucracy of the Lehigh Valley Railroad Company from a train conductor’s view. The collection contains bulletins, supplements to bulletins, correspondence about operation of trains, train fares, schedules of train stations, time tables, conductor’s documentation of passengers’ destinations, tickets issued and material especially about the Black Diamond Express – the LVRR’s most famous train.