Columbia subject headings:
Gas fields--Asia, Central--Maps.
Gas fields--Europe--Maps.
Gas industry--Asia, Central--Maps.
Gas industry--Europe--Maps.
Maps.
Oil fields--Asia, Central--Maps.
Oil fields--Europe--Maps.
Petroleum industry and trade--Asia, Central--Maps.
Petroleum industry and trade--Europe--Maps.
Pipelines--Asia, Central--Maps.
Pipelines--Europe--Maps.
Harvard subject headings:
Gas fields--Asia, Central--Maps.
Gas fields--Europe--Maps
Gas industry--Asia, Central--Maps.
Gas industry--Europe--Maps.
Oil fields--Asia, Central--Maps.
Oil fields--Europe--Maps.
Petroleum industry and trade--Asia, Central--Maps.
Petroleum industry and trade--Europe--Maps.
Pipelines--Asia, Central--Maps.
Pipelines--Europe--Maps.
Princeton subject headings: