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O. volvulus is transmitted by sandflies, and their role in the transmission of onchocerciasis was discovered by the Scottish parasitologist Breadablane Blacklock in Sierra Leone in the mid-1920s (19). There are accounts of the history of onchocerciasis by Grove (105) and Muller (192).
Settlers from Connecticut discovered the anthracite coal seams in the Wyoming Valley in 1762. The first recorded use of anthracite coal was in 1768. In 1775, mining of anthracite started in northeast Pennsylvania. The mine was located near Pittston. Wilkes-Barre saw the start of anthracite mining in 1776, with the mining occurring from outcrops along the banks of the Susquehanna River. In 1790, anthracite is discovered in the Schuylkill region of Pennsylvania and in 1792 anthracite is discovered in the Lehigh region of Pennsylvania.