Most of the southern IC objects were discovered by DeLisle Stewart and Royal Frost using a 24" refractor and photography at Arequipa in Peru.
Here are four interesting articles:
In Search of Better Skies: Harvard in Peru
http://www.americanscientist.org/iss...int/issue.aspx
http://www.americanscientist.org/iss...int/issue.aspx
http://www.americanscientist.org/iss...int/issue.aspx
http://www.jstor.org/stable/10.2307/40667008
The attached file lists the people who found IC objects south of declination -25.