The Underground Haulage of Coal by Wire Ropes - Including the System of Wire Rope Tramways as a Means of Transportation for Mining Products; A Practical Essay Written for John a Roebling's Sons Co; Of Trenton, N. J #232648

It was originally our intention to confine this treatise solely to underground haulage, but while preparing the same we received so many inquiries about wire rope tramways that we considered the subject but incompletely treated without describing this method of over ground transportation, which in many mining districts already plays an important part, and promises with every year to become more and more extended.