The records of the Cambria Inclined Plane Company are primarily related to the physical plant, particularly the wire ropes used to raise and lower the cars. There is also some general information on operations, schedules, and rates.

The Plymouth Cordage Company of North Plymouth, Massachusetts, was founded in 1824 and was involved, as their name implies, in the rope-making industry, particularly for use by the shipping and fishing industries. This album contains sixteen photographs of plant interiors showing machinery and manufacturing processes, and two exterior views of the building.