Better source for railroad start date
Add India Point rail track details
Add Cove geometry for 1835 and adjacent wetlands
Add Pawtucket marker point with founding year
Trace path of Blackstone Canal from 1847 map
Add Woonasquatucket River from 1887 USGS
Add Providence and Worcester Railroad 1847 stations
Continue railroad tracks to Worcester
Add missing sources to natural features
Add some natural features north of Providence
Add some roads between Providence and Pawtucket
Add some natural wood from map