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@@ -202,10 +202,19 @@ P \approx 38\frac{bu}{acre} &&
 This crop productivity is in remarkable agreement with the 1917 USDA yields, $35bu/acre$, which seems to validate the assumed 100,000 person population of Tenochtitlan.  Some references \cite{Chinampas_1964} describe an extensive tribute system that Aztec government required of it's subjects, which certainly would have been necessary to support populations on the upper end of historical estimates \cite{400k}.
 
 \section{Example: Was the Irish Potato Famine a Natural Disaster?}
+In contrast to cultures of the Americas, Ireland's population boomed with the introduction of the potato. \cite{potato,little_ice_age}.  
 
 \section{Conclusion}
 
 
+
+
+
+
+
+
+
+
 %\begin{acknowledgments}
 %\ack
 %The work was influenced and improved by discussions with 
@@ -321,9 +330,9 @@ Encyclopedia of Food Sciences and Nutrition (Second Edition),
 Academic Press,
 2003,
 Pages 5762-5767,
-ISBN 9780122270550,
-https://doi.org/10.1016/B0-12-227055-X/01188-3.
-(https://www.sciencedirect.com/science/article/pii/B012227055X011883)
+%ISBN 9780122270550,
+%https://doi.org/10.1016/B0-12-227055-X/01188-3.
+%(https://www.sciencedirect.com/science/article/pii/B012227055X011883)
 
 \bibitem{trout}
 The wilderness river might be full of trout, but if they're $300kcals$ each, you'll have to catch, clean, and smoke $10$ of them to store up a day's food. \url{https://fdc.nal.usda.gov/fdc-app.html#/food-details/175154/nutrients}
@@ -479,5 +488,21 @@ Self-published work by Wikipedia user Madman2001
 ImageJ is a free tool for measurement of photographic data.  
 \url{https://imagej.nih.gov/ij/}
 Schneider, C. A., Rasband, W. S., \& Eliceiri, K. W. (2012). NIH Image to ImageJ: 25 years of image analysis. Nature Methods, 9(7), 671–675. doi:10.1038/nmeth.2089
+
+\bibitem{potato}
+The History and Social Influence of the Potato
+Redcliffe N. Salaman  (Author), J. G. Hawkes (Editor)
+Cambridge University Press
+1985
+
+\bibitem{little_ice_age}
+The Little Ice Age: How Climate Made History 1300-1850
+Brian Fagan
+Basic Books 2001
+
+\bibitem{Ireland_5M}
+https://www.theguardian.com/world/2021/aug/31/ireland-population-surpasses-5m-for-first-time-since-1851
+
+
 \end{thebibliography}
 \end{document}