Columbia subject headings:
Lead abatement--Research--United States--Data processing.
Lead abatement--Research--United States--Databases.
Soils--Lead content--Research--United States--Data processing.
Soils--Lead content--Research--United States--Databases.
Harvard subject headings:
Lead abatement--Research--United States--Data processing.
Lead abatement--Research--United States--Databases.
Soils--Lead content--Research--United States--Data processing.
Soils--Lead content--Research--United States--Databases.
Princeton subject headings: