Astronomical Supplement to the Astronomical Almanac | |
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Astronomical Supplement to the Astronomical Almanac | The specification for the Eastern Time Zone is set forth at 49 CFR 71 |
The boundary between Eastern and Central is set forth at 49 CFR 71 | Astronomical Almanac Online 2015, Glossary s |
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Patton, Jessica 7 October 2020 | 5, and is listed in and formats |