Added a few sentences about relief efforts, cited sources.
Barry, John M. "Rising Tide: The Great MIssissippi RIver Flood of 1927 and How It Changed America"
Checked article throughout for plagiarism and uncited information.
Linked article to other Wikiarticles throughout
WWII, Mississippi River, etc.
San Francisco Earthquake, 1906
Added better citations throughout and checked for plagiarized information
Thatcher, Wayne. "Strain accumulation and release mechanism of the 1906 San Francisco Earthquake"
Ellsworth, W. L.; Lindh, A. G.; Prescott, W. H.; Herd, D. G.; Simpson, David W.; Richards, Paul G. "The 1906 San Francisco Earthquake and the Seismic Cycle."
Wald, David J.; Kanamori, Hiroo; Helmberger, Donald V.; Heaton, Thomas H. "Source study of the 1906 San Francisco earthquake"
Borcherdt, Roger D.; Gibbs, James F. "Effects of local geological conditions in the San Francisco Bay region on ground motions and the intensities of the 1906 earthquake".
Odell, Kerry A.; Weidenmier, Marc D. "Real Shock, Monetary Aftershock: The 1906 San Francisco Earthquake and the Panic of 1907".
2010 Guatemala City Sinkhole
Added information under formation about general sinkhole formation
North, Leslie A.; Polk, Jason S.; Nedvidek, Daniel. "Getting Revved Up About Sinkholes!"
Added information under collapse and aftermath
"Physical Modeling on Sand Erosion around Defective Sewer Pipes under the Influence of Groundwater"
Hermosilla, R. "New Information on the Guatemala City Sinkholes from Post Collapse Investigations"
Checked article for plagiarism, added citations where necessary
Hermosilla, Rodolfo G. "The Guatemala City sinkhole collapses"
Linked other wikiarticles throughout
2007 Guatemala City sinkhole
Feral goats, Galapagos (I just did this one because it's very interesting information!!)
Added information to Feral Goat article, subcategory Galapagos.
Contributed about 2 paragraphs of information (essentially what was presented in the Invasive Species presentation)
Cited information, linked article to smithsonian.org as well as galapagos.org
I would have linked the article to a Project Isabela wikiarticle, but it doesn't exist :(