In the late 1800s and early 1900s, many cities were facing the same issue: so much horse manure, they couldn't keep up with it. It created unhygienic conditions, and very real problems.
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Behind the Scenes Minis: Busses and Overpasses
22:32

Robert Moses and the Shaping of New York, Part 2
42:12

Robert Moses and the Shaping of New York, Part 1
41:59