Exerpt from the official D.O.N.A.L.D. homepage:

D.O.N.A.L.D. (Deutsche Organisation Nichtkommerzieller Anhänger des Lauteren Donaldismus / German organisation of non-commercial follower of sincere donaldism) is an association of people, who care about the duck family andthe world they are living in. The association was founded in Germany in1976, hence the word "Deutsche" in the title. German citizenship is not compulsory to become a member.

The Donaldists are currently publishing a magazine called "Der Donaldist" (in German) relating all ceremonies held during the donaldistic year and all
the very scientific articles on such problems as "how come that ducks show sometimes teeth and sometimes not", "genealogy of the duck family", "where is Duckburg located?", "physics in Duckburg" a.s.o. One example of a ceremony report, the "Mairennen" as well as one scientific article (on the shoe-wear of the ducks) are available online. (in German)
Members are splitted in Barks-only people and all the other.

The English version is here (made available by Germund Silvegren)

More information on how to become a member can be obtained by writing to:

Geldspeicher der D.O.N.A.L.D.
Thorsten Bremer
St.-Magnus-Straße 70
28217 Bremen
GERMANY
Tel.: +49 421 39099980