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The following reply is from the United Nations Archives:
"We generally don't have much information about Permanent Representatives, since they are appointed by their own governments. However, there are quite a few files on "Urrutia" - they may concern the Representative since they are from the same time period that he was active with the United Nations: https://search.archives.un.org/informationobject/browse?topLod=0&query=Urrutia.
There are a few images of Mr. Urrutia-Holquin here: http://www.unmultimedia.org/photo/gallery.jsp?query=Urrutia, and some video here: http://www.unmultimedia.org/avlibrary/search/search.jsp?mediatype=&prod=1&q=Urrutia.
The other place to contact would be the Colombian National Archives - http://www.archivogeneral.gov.co/datos-de-contacto"
Best of luck in your research!