Most canals filled during efforts to remove coal silt (11 фев 1947 г. – 13 дек 1979 г.)
Описание:
Excursion vessels and pleasure boating remained active on the Schuylkill Navigation until most of the canals were filled by the Commonwealth of Pennsylvania during 1947–1979 in efforts to remove coal silt from the Schuylkill River.Добавлено на ленту времени:
Дата:
11 фев 1947 г.
13 дек 1979 г.
~ 32 years
