Sobralia Orchids on Stamps - A complete listing of all known Sobralia orchids on stamps, with photos. www.geocities.com/avosite/Sobralia/Sobralia_TheStamps.html
Stanhopea Orchids on Stamps - A complete listing of all known Stanhopea orchids on worldwide stamps, with photos. www.geocities.com/RainForest/1289/Stanhopea/Stanhopea_TheStamps.html
Wild and Domestic Cats on Stamps - Comprehensive listing of many worldwide postage stamps for sale. hometown.aol.com/timpumbaa/myhomepage/sale.html
WWF , Butterflies, and Animals on stamps - Butterflies and Moths, World Wildlife Fund comprehensive price lists. Updates regularly. hometown.aol.com/cdf624/myhomepage/index.html