• Apex Altitude A charity that exists to perform high altitude medical research and educate the public about the topic

• Birmingham Medical Research Expeditionary Society Site of a group of medical scientists studying the effects of altitude and the causes and management of acute mountain sickness.

• High Altitude Medicine About the book by Herb Hultgren, M.D., including ordering information.

• High-Altitude Medical Guide Information on the prevention, recognition, and treatment of altitude illness, as well as other health issues affecting travelers to destinations at altitude.

• HypoMed Global Services Information on Hypoytherapy/Hypoxytraining. About the annual international 'Hypoxia in Medicine' conference.

• Hypoxia Information about the International Hypoxia Symposium including abstracts.

• International Society for Mountain Medicine Altitude tutorial. Newsletter archive. About the World Congress on Mountain Medicine and High Altitude Physiology.

• Medex and Medical Expeditions Information about and from this research charity dedicated to investigating the mechanisms of altitude related illness. Newsletter archive and planned expedition information.