Analysis of information sources in references of the Wikipedia article "Amtrak's 60 Hz traction power system" in English language version.
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ignored (help) doi:10.1109/PESS.1999.784390.{{cite book}}
: |journal=
ignored (help) doi:10.1109/PESS.1999.784390.{{cite book}}
: |journal=
ignored (help) doi:10.1109/PESS.1999.784390.{{cite book}}
: |journal=
ignored (help) doi:10.1109/PESS.1999.784390.