This column originally appeared in the American Philatelic Society's monthly magazine, "The American Philatelist." Since then some of the information may be out-of-date depending on how far back you're reading.

January 2001

(...)

"Petroleum: The Black Gold" is an online thematic stamp exhibition that covers many aspects of petroleum oil --- origin, prospecting, drilling, refining, petrochemical plants, oil terminals, pipelines, famous people and of course companys.

The site has some 79 pages of exhibition pages, which are essentially good scans of the pages that have appeared in stamp show exhibition competitions. Curiously, though the site itself is in Portugese, the exhibition text is in English.

"Amostragem" leads to the exhibition pages.

Petroleum: The Black Gold

http://www.professorsoares.adv.br/petros.html"

(in: http://www.glassinesurfer.com/arc/gs0101.shtml)