1![news and views Hamburg defining ten parts per million of nitrogen oxides as the upper level of effluent from fossil-fuel burners. This is quite a difficult limit to achieve because ordinary flame burners give off roughly news and views Hamburg defining ten parts per million of nitrogen oxides as the upper level of effluent from fossil-fuel burners. This is quite a difficult limit to achieve because ordinary flame burners give off roughly](https://www.pdfsearch.io/img/a8c575da9ac43f5d54bcf3f41f8f6aec.jpg) | Add to Reading ListSource URL: luo-lab.uchicago.eduLanguage: English - Date: 2012-01-06 10:50:11
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2![Palaeontologia Electronica http://palaeo-electronica.org Eoconodon (“Triisodontidae,” Mammalia) from the Early Paleocene (Puercan) of northeastern Montana, USA William A. Clemens Palaeontologia Electronica http://palaeo-electronica.org Eoconodon (“Triisodontidae,” Mammalia) from the Early Paleocene (Puercan) of northeastern Montana, USA William A. Clemens](https://www.pdfsearch.io/img/f79797be2a79542393bb5aea4f6d9978.jpg) | Add to Reading ListSource URL: palaeontologia-electronica.earthsci.carleton.caLanguage: English - Date: 2011-11-24 16:02:47
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3![[removed] [removed]](https://www.pdfsearch.io/img/6f0582a544ba0d290d509a49371a683e.jpg) | Add to Reading ListSource URL: www.ivpp.cas.cnLanguage: English - Date: 2010-08-24 04:17:13
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4![](https://www.pdfsearch.io/img/e1873aba202a0be91570ce7d017229b3.jpg) | Add to Reading ListSource URL: digitallibrary.amnh.orgLanguage: English - Date: 2011-06-22 16:46:50
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5![](https://www.pdfsearch.io/img/95e600dfa80f0e27e98e8ef33043026b.jpg) | Add to Reading ListSource URL: digitallibrary.amnh.orgLanguage: English |
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6![](https://www.pdfsearch.io/img/57e9c44358a8b8912f86ceff32c63b38.jpg) | Add to Reading ListSource URL: digitallibrary.amnh.orgLanguage: English |
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