Columbia subject headings:
Natural gas pipelines--Law and legislation--Azerbaijan.
Natural gas pipelines--Safety regulations--Azerbaijan.
Petroleum pipelines--Law and legislation--Azerbaijan.
Petroleum pipelines--Safety regulations--Azerbaijan.
Harvard subject headings:
Natural gas pipelines--Law and legislation--Azerbaijan.
Natural gas pipelines--Safety regulations--Azerbaijan.
Petroleum pipelines--Law and legislation--Azerbaijan.
Petroleum pipelines--Safety regulations--Azerbaijan.
Princeton subject headings: