In 1991 , it was transferred again to Groningen and the Aa - kerk .
In 1635 , the organ was transferred to the Broerkerk in Groningen and in 1877 it was transferred back to the Martinikerk in Bolsward .
In 1991 , organ was transferred again to Groningen and the Aa - kerk .
In 1635 , the organ was transferred to the Broerkerk in Groningen and in 1877 it was transferred back to the Martinikerk in Bolsward .