Chester County was one of the three original counties established by William Penn, giving it a long history of settlement and growth. Around Avondale and West Grove features historic postcards from Avondale, Baker�s Station, Chatham, West Grove, and the surrounding area. Jennersville, located in Penn Township, has close ties to the rose industry begun in London Grove. This area was a rich agricultural district that had many nurseries (including one of world renown), creameries, mushroom farms, horse farms, an experimental farm for research, and other agricultural ventures. White Clay Creek, now a federally designated wild and scenic river, supported many mills. Granite and marble supplied the quarry industry. The township�s location along the main highways between Lancaster, Wilmington, Philadelphia, and Baltimore made it an important route for commerce.