Key to Census Data Layers:

lkb = Railroads

lpy = Lake Polygons

lka = Roads

lkc = Power Lines

lkh = Creeks, Streams, or Rivers

uni = Unified School Districts

elm = Elementary School Districts

sec = Secondary School Districts

sldl = State Legislative District Lower

sldu = State Legislative District Upper

wat = Water Polygons

kgl = Key Geographic Locations

lpt = Points of Interest

plc = Populated areas (such as towns)

vot = Voting Districts