| Map Layer | Map Layer Opacity |
|---|---|
| Northern Manhattan 1870 (Knapp) | |
| Northern Manhattan and Westchester 1871 | |
| Kingsbridge 1885 Map (E. Robinson) | |
| Marble Hill and Kingsbridge Street Improvements 1895 | |
| Spuyten Duyvil Hill Street Improvements 1895 | |
| Spuyten Duyvil Hill 1938 (Bromley) |