Torre Ejecutiva Pemex Explosion

http://en.wikipedia.org/wiki/2013_Pemex_explosion

http://www.hazardexonthenet.net/article/55896/Fatal-explosion-and-fire-devastates-Pemex-HQ-in-Mexico-City.aspx?AreaID=2

http://www.guardian.co.uk/world/2013/jan/31/mexico-americas

http://www.reuters.com/article/2013/02/01/us-mexico-pemex-idUSBRE90U1FF20130201

http://www.bbc.co.uk/news/world-latin-america-21288214,
http://www.infopig.com/keywords/explosion.html

http://www.euronews.com/2013/02/01/casualties-expected-to-rise-in-fatal-mexico-city-tower-explosion

http://en.wikipedia.org/wiki/Torre_Ejecutiva_Pemex:
http://skyscraperpage.com/diagrams/?countryID=23

http://en.wikipedia.org/wiki/Category:Disasters_in_Mexico, 
http://www.bbc.co.uk/news/world-latin-america-18170525

Singapore

http://en.wikipedia.org/wiki/Singapore

http://www.cnbc.com/id/100418370

http://www.ft.com/cms/s/0/a5d2179a-6532-11e2-a3db-00144feab49a.html#axzz2JxGC45MA

Urban Disasters

http://en.wikipedia.org/wiki/Surviving_Urban_Disasters

http://disastersurvingtips.blogspot.ca/2012/06/surviving-urban-disasters-do-you-know.html

http://urbansurvivalsite.com, http://www.urbansurvival.com & http://www.urbansurvival.com/blog,
http://lifehacker.com/5889600/macgyver-survivalist-or-stockpiler-the-urban-survival-skills-everyone-needs-to-know

http://blogs.cfr.org/patrick/2012/08/14/man-made-cities-and-natural-disasters-the-growing-threat

http://www.unisdr.org/we/inform/publications/11000, http://www.planetizen.com/node/37045

http://www.springer.com/law/environmental/book/978-3-642-29469-3

http://www.infowars.com/hurricane-aerosol-and-microphysics-program-the-dhs-research-project-on-hurricane-modification

http://jfdatalinks.blogspot.ca/2013/02/new-orleans-and-superdome.html

The Montreal Flood

http://news.ca.msn.com/canada/cause-of-montreal-flood-old-pipes-city-says

Greatest Cities In Human History

http://www.businessinsider.com/largest-cities-throughout-history-2013-1?utm_source=msnca&utm_medium=referral&utm_term=&utm_content=122&utm_campaign=partner#

http://aerialarchives.photoshelter.com/search?I_DSC=aerial%20photograph%20Mark%20Hopkins%20hotel&_ACT=search&I_DSC_AND=t