This coarse-scale generalization of the pipeline system depicts lines for crude oil, natural gas, refined products, and LPG/NGL (Liquified Petroleum Gas/Natural Gas Liquids). Pipelines in the adjacent Canadian provinces are limited to those exceeding 20in (50.8 cm) in diameter. Data sources: 2006 Pennwell Corp.; 1999 EGRID; 1996 NEI.
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