21 | Add to Reading ListSource URL: physics.nist.govLanguage: English - Date: 2011-06-02 19:00:28
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22 | Add to Reading ListSource URL: physics.nist.govLanguage: English - Date: 2011-12-23 13:24:29
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23 | Add to Reading ListSource URL: usnavymuseum.orgLanguage: English - Date: 2011-11-10 22:32:12
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24 | Add to Reading ListSource URL: www.nist.govLanguage: English - Date: 2010-07-21 15:50:42
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25 | Add to Reading ListSource URL: physics.nist.govLanguage: English - Date: 2011-06-08 12:13:22
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26 | Add to Reading ListSource URL: www.nist.govLanguage: English - Date: 2010-07-21 15:50:40
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27 | Add to Reading ListSource URL: www.wmo.intLanguage: English - Date: 2013-01-25 09:16:26
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28 | Add to Reading ListSource URL: www.bipm.orgLanguage: English - Date: 2012-10-03 07:40:28
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29 | Add to Reading ListSource URL: hem.passagen.seLanguage: English - Date: 2011-12-14 16:02:16
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30 | Add to Reading ListSource URL: www.atomwave.orgLanguage: English - Date: 2011-11-30 15:37:50
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