Cacti and Succulents Link
INTERNATIONAL CODE OF BOTANICAL NOMENCLATURE online
the Deutsche Kakteen-Gesellschaft (DKG) , Germany
The Cactus and Succulent Society of America (CSSA) , USA
SPKS - Spolek pěstitelů kaktusů a sukulentů v Praze, zal. 1922
Associazione Italiana Amatori Piante Succulente , Italy
Nederlands/Belgische vereniging van liefhebbers van cactussen en vetplanten
The International Organization for Succulent Plant Study (IOS)
The 'Kaktus-Klub' journal, Russia
, By Valentino Vallicelli,Italy
Blog of Cactus and Succulent
Homepage of Andrea Lohmuller + Friedrich A. Lohmuller , Germany
SSK Study Community of South American Cacti , By Rainer Mecklenburg etc.
SagtaCactus' photostream , By Sebastian Hugo Santecchia, Salta, Argentina
Kakteensammlung-Holzheu.de , By Ralf Holzheu, Germany
, By Michael Kiesling , Germany
, By Pavel Klouda, Czech Republic
, By Alexander Kovalevich, Russia
Ariocarpus Living Rocks from Mexico , By Geoff Bailey & John Miller, UK
, By Klaus-Peter Kleszewski , Germany
,By Jakub Jilemicky, Czech Republic
CACTUSALTA, By Esteban Paker - TITO -, Salta, Argentina
, By G. Anceschi & A. Magli,Italy
Cacti collection-Holzheu, By Ralf Holzheu, Germany