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| 1990 || || || "Search Methods Before the Internet – Phonebook"<ref name="seo.comf"/>
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| 1991 || || || English computer scientist {{w|Tim Berners-Lee}} sets up a in {{w|Geneva}} launches his WWW Virtual Library <code>vlib.org</code>. It is considered the oldest catalog on the [[w:World Wide Web|Web]].<ref name="wordstream.come">{{cite web |title=THE HISTORY OF SEARCH ENGINES |url=https://www.wordstream.com/articles/internet-search-engines-history |website=wordstream.com |accessdate=7 January 2020}}</ref><ref>{{cite book |last1=Van Rys |first1=John |last2=Meyer |first2=Verne |last3=Sebranek |first3=Patrick |title=The Research Writer, Spiral bound Version |url=https://books.google.com.ar/books?id=g4HP5TIs2-cC&pg=PA84&dq=Tim+Berners-Lee+set+up+a+Virtual+Library+%221991%22&hl=en&sa=X&ved=0ahUKEwi2l_vUlNToAhXTILkGHRNVD5IQ6AEIKDAA#v=onepage&q=Tim%20Berners-Lee%20set%20up%20a%20Virtual%20Library%20%221991%22&f=false}}</ref><ref>{{cite book |last1=Scheeren |first1=William O. |title=The Hidden Web: A Sourcebook |url=https://books.google.com.ar/books?id=KgTqbPXQqroC&pg=PA46&dq=Tim+Berners-Lee+set+up+a+Virtual+Library+%221991%22+vlib.org&hl=en&sa=X&ved=0ahUKEwjCgvDOltToAhWNI7kGHTwQCDIQ6AEIMzAB#v=onepage&q=Tim%20Berners-Lee%20set%20up%20a%20Virtual%20Library%20%221991%22%20vlib.org&f=false}}</ref><ref>{{cite book |last1=Tortosa |first1=Virgilio |title=Escrituras digitales: tecnologías de la creación en la era virtual |url=https://books.google.com.ar/books?id=5UF-g_q2rqQC&pg=PA179&dq=Tim+Berners-Lee+set+up+a+Virtual+Library+%221991%22+vlib.org&hl=en&sa=X&ved=0ahUKEwjCgvDOltToAhWNI7kGHTwQCDIQ6AEIPDAC#v=onepage&q=Tim%20Berners-Lee%20set%20up%20a%20Virtual%20Library%20%221991%22%20vlib.org&f=false}}</ref>
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| 1991 || || || "It is believed that SEO was born in 1991. Around this time, the world’s first website was launched, and one quickly turned into many as websites crowded the internet. So, there was a huge need for structure and accessibility, and the world’s first search engines were created. "<ref name="bluefrogdm.coms">{{cite web |title=A BRIEF HISTORY OF SEO |url=https://www.bluefrogdm.com/blog/a-brief-history-of-seo |website=bluefrogdm.com |accessdate=7 January 2020}}</ref>