21-centimetre radiation: References & Edit History
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Article History
| Type | Description | Contributor | Date |
|---|---|---|---|
| Article revised and updated. | Nov 19, 2020 | ||
| Modified link of Web site: MIT Haystack Observatory - The Hydrogen 21-cm Emission Line. | Jun 08, 2017 | ||
| Add new Web site: Hyperphysics - The Hydrogen 21-cm Line. | Oct 03, 2012 | ||
| Add new Web site: National Radio Astronomy Observatory - The HI 21 cm Line. | Oct 03, 2012 | ||
| Add new Web site: MIT Haystack Observatory - The Hydrogen 21-cm Emission Line. | Oct 03, 2012 | ||
| Add new Web site: Massachusetts Institute of Technology Haystack Observatory - Hydrogen 21-cm Emission line. | Oct 03, 2012 | ||
| Add new Web site: National Radio Astronomy Observatory - Green Bank Telescope - Prediction of 21cm line radiation. | Oct 03, 2012 | ||
| Article revised and updated. | Sep 16, 2008 | ||
| Article revised. | Jun 29, 2000 | ||
| Article added to new online database. | Jul 20, 1998 |
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