Layer Estimates:

Layer: BlockGroups_OrdinaryLeastSqu (ID:0)
Count: 20983
Extent:

XMin: -124.409591000494
YMin: 32.5341560000728
XMax: -114.131210999948
YMax: 42.0095180002276
Spatial Reference: GEOGCS["WGS 84",DATUM["World Geodetic System 1984",SPHEROID["WGS 84",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["degree",0.0174532925199433]]

Layer: BlockGroupNitrate_Statistics (ID:1)
Count: 21078

Layer: demographics (ID:2)
Count: 0

Layer: OLS3 (ID:3)
Count: 7