21![Heinrich Christian Schumacher - astronomer and geodesist Tõnu Viik Heinrich Christian Schumacher - astronomer and geodesist Tõnu Viik](https://www.pdfsearch.io/img/59d9c38f82cafdd6380bfa2a320aa29b.jpg) | Add to Reading ListSource URL: www.aai.eeLanguage: English - Date: 2010-09-19 05:11:30
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22![](https://www.pdfsearch.io/img/d6484c75693f0a8d0c9f47b3e5fc3891.jpg) | Add to Reading ListSource URL: www.ies.eeLanguage: English - Date: 2013-05-30 08:32:06
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23![](https://www.pdfsearch.io/img/cfa9cf7ee5b8c75b868537c902674c12.jpg) | Add to Reading ListSource URL: www.aai.eeLanguage: English - Date: 2009-07-25 02:37:58
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24![](https://www.pdfsearch.io/img/481f22998786ce3fe93c5c64acfdcab0.jpg) | Add to Reading ListSource URL: oralhistories.library.caltech.eduLanguage: English |
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25![](https://www.pdfsearch.io/img/88d42438d15f52933bc0517a279074dd.jpg) | Add to Reading ListSource URL: books.nap.eduLanguage: English - Date: 2010-07-06 07:30:30
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26![](https://www.pdfsearch.io/img/4bfe79f5031ac735cfaadf897970f346.jpg) | Add to Reading ListSource URL: www.fig.netLanguage: English - Date: 2010-11-10 05:00:38
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27![](https://www.pdfsearch.io/img/522446f8eee64b9d18519717eb4444c2.jpg) | Add to Reading ListSource URL: tech.mit.eduLanguage: English - Date: 2001-05-04 01:57:59
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28![](https://www.pdfsearch.io/img/2a6bfe64d4cdef44f8812984c7aa3c16.jpg) | Add to Reading ListSource URL: www.fig.net- Date: 2010-11-10 05:04:26
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