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Alfeld, Peter. Eratosthenes of Cyrene. 02-Jun-1998. 

http://www.math.utah.edu/~alfeld/Eratosthenes.html 

"Hero of Alexandria." Funk and Wagnalls Online. 1999. 

http://www.funkandwagnalls.com/encyclopedia/low/articles/h/h011000819f.html

"Ctesibius." Encarta Online Deluxe. 1999. 

http://encarta.msn.com/encarta/Contents.asp?pg=2&ti=761583153

"Eratosthenes." Encarta Online Deluxe. 1999 . 

http://encarta.msn.com/encarta/Contents.asp?pg=2&ti=761583153

" Ctesibius of Alexandria."  Britannica Online.  1999. 

http://www.britannica.com/bcom/eb/article/0/0,5716,28547+1+28098,00.html

"Hero of Alexandria."  Britannica Online.  1999.  

http://www.britannica.com/bcom/eb/article/0/0,5716,41048+1+40189,00.html

"Eratosthenes of Cyrene."  Discovering World History. 2000 

http://galenet.gale.com/a/acp/netacgi/nph-brs?d=DTCW&s1=Eratosthenes&s2=discovering+history&s3=fullsearch&pg1=FT&pg2=PD&pg3=ST&l=50&p=1&u=/a/acp/db/dtcw/index.html&r=4&f=G

"Ctesibius of Alexandria"  Discovering World History. 2000 

http://galenet.gale.com/a/acp/netacgi/nph-brs?d=DTCW&s1=Ctesibius&s2=discovering+history&s3=fullsearch&pg1=FT&pg2=PD&pg3=ST&l=50&p=1&u=/a/acp/db/dtcw/index.html&r=1&f=G

"Hero of Alexandria" Discovering World History. 2000 

http://galenet.gale.com/a/acp/netacgi/nph-brs?d=DTCW&s1=Ctesibius&s2=discovering+history&s3=fullsearch&pg1=FT&pg2=PD&pg3=ST&l=50&p=1&u=/a/acp/db/dtcw/index.html&r=2&f=G

Gillispie, Charles Coulston.  Dictionary of scientific biography. New York: Scribner, 1980.

Cambridge Latin Course Unit 2*. University of Cambridge.

*most pictures taken from Cambridge Latin Course

Revised: May 07, 2000 .

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By: Anson Au and Joe Yeh
Last modified: May 07, 2000