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2. Corundum - Wikipedia

   en.wikipedia.org/wiki/Corundum

   Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium, and chromium. [ 3 ] [ 4 ] It is a rock -forming mineral . It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [ 7 ]

3. Corundum (structure) - Wikipedia

   en.wikipedia.org/wiki/Corundum_(structure)

   When A is nonmetallic and B is metallic, the structure becomes the antiphase of corundum, called the anticorundum structure type, [8] with examples including β-Ca 3 N 2 [9] and borates. Ternary and multinary compounds can also exists in the corundum structure. The corundum-like structure with the composition A 2 BB'O 6 is called double ...

4. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   A commercial PDF editor, markup and collaboration product aimed at engineering and architectural markets. Foxit Reader: Freeware: Highlight text, draw lines, measure distances of PDF documents. Foxit PDF Editor Suite: Free trial: Integrated PDF Editing and eSign anywhere. Optionally, ChatGPT+ gDoc Fusion: Proprietary/Shareware

5. File:Vietnam Magazine Vol. V, Nº 4 1972.pdf - Wikipedia

   en.wikipedia.org/wiki/File:Vietnam_Magazine_Vol...

   The government of the Socialist Republic of Vietnam maintains that between 2 September 1945 and 2 July 1976 only the Democratic Republic of Vietnam and the Republic of South Vietnam were legitimate governments and that any rival governments were illegal ("reactionary" or "counter-revolutionary") organisations.

6. Help:Download as PDF - Wikipedia

   en.wikipedia.org/wiki/Help:Download_as_PDF

   In the Print/export section select Download as PDF. The rendering engine starts and a dialog appears to show the rendering progress. When rendering is complete, the dialog shows "The document file has been generated. Download the file to your computer." Click the download link to open the PDF in your selected PDF viewer.

7. Wikipedia:PDF - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:PDF

   Wikipedia:Citing sources#Linking to pages in PDF files, how to cite long PDF files as article sources Wikipedia:Extended image syntax#Page , how to insert a page from a PDF on Commons into an article Help:Download as PDF , how to download an article as a PDF