@Book{110056191,
author="Eckhardt, George H.",
title="Pennsylvania clocks and clockmakers: an epic of early American science, industry, and craftsmanship",
year="1955",
publisher="Crown Publ.",
address="New York",
keywords="Clocks and watches; United States; Clock and watch makers; Pennsylvania",
note="George H. Eckhardt",
language="English"
}