Jim Maupin's original website - now defunct - available only through the Wayback Machine internet archive.
Jim Maupin Ltd.
http://web.archive.org/web/20010210012703/http://www.jcpress.com/JMaupinLtd/carbon.htm
Jim Maupin's original website - now defunct - available only through the Wayback Machine internet archive.
Copyright remains with original authors