TheFrenchHorn.net offers extensive information and links such as:
International Horn Society is dedicated to the performance, teaching, composition, research, and promotion of the horn as a musical instrument. The IHS has over 3,500 members from 55 countries around the globe, including internationally renowned touring artists, symphony musicians, university teachers, students, horn designers/builders, composers, music libraries, music publishers, and amateur players of all ages. The society has something to offer every horn player and enthusiast and also publishes “The Horn Call” a magazine for horn players. (Excerpt taken from Wikipedia)
The IHS site offers information regarding: