Layer Estimates:

Layer: river_polygon_1964 (ID:0)
Count: 1
Extent:

XMin: -13467115.5349
YMin: 4226627.5979
XMax: -13466309.1859
YMax: 4227554.3527
Spatial Reference: 102100 (3857)

Layer: river_polygon_2001 (ID:1)
Count: 1
Extent:

XMin: -13467148.4665
YMin: 4226593.0755
XMax: -13466279.8239
YMax: 4227785.2804
Spatial Reference: 102100 (3857)

Layer: river_polygon_1937 (ID:2)
Count: 1
Extent:

XMin: -13467200.4365
YMin: 4226592.2531
XMax: -13466331.7939
YMax: 4228813.2933
Spatial Reference: 102100 (3857)