University of St. Andrews (UK)
University of St. Andrews: Contributions of Apollonius
This site, provided by the University of St. Andrews in Scotland, describes the contributions of Apollonius of Perga.
Wolfram Research
Wolfram Science World: Apollonius of Perga (Ca. 262 Ca. 190 Bc)
A very brief biography of this Greek geometer. Good hyperlinks to theories he developed.
University of St. Andrews (UK)
University of St. Andrews: Quotation by Apollonius
This site, which is provided for by the University of St. Andrews, contains a quote of Apollonius from the Preface to Book 1 of "Conics."