CORRESPONDENCE. THE NEWYORK RAPID TRANSIT SUBWAY.

Keywords: SUBWAYS, RAPID TRANSIT, UNDERGROUND, RAILWAYS, PUBLIC, TRANSPORT, HUMIDITY, VENTILATION, INVESTIGATIONS, TEMPERATURE, AIR, ANALYSIS, IRON, DUST, IMPURITIES, DISEASES, BURSTS, MAINS, WATER, PLATFORMS, RAILS, CURVES, CITIES, NEW YORK, USA, UNITED STATES