OBER correspondence courses have been created in 1932 by Marc'harid Gourlaouen (1902-1987).
Since then, thanks to these courses, thousands of people have been able to learn, improve, or simply get the elementary basis of Breton language.
Breton is a Celtic language, coming from Indo-European. Modern Celtic languages are:
Gaelic branch:
Gaelic from Ireland
Gaelic from Scotland
Gaelic from Isle of Man
Breton branch:
Breton (Brittany)
Cornish (Cornwall Island)
Welsh (Wales)