Herder Verlag AG is currently re-translating and re-publishing the Montessori texts. These can be purchased at a reduced price on a ‘subscription’ basis. When complete, there will be 21 texts. They have a distinctive yellow/orange cover.
I have tried to match the new German editions to the English list:
Herder 2010:Die Entdeckung des Kindes.
The Discovery of the Child, Maria Montessori
Herder 2010: Praxishandbuch der Montessori-Methode
Dr Montessori’s Own Handbook (1914 English and 1922/1928 German)
Herder 2010: Erziehung und Gesellschaft
Education and Society (collected works)
Herder 2011: Das Kind in der Familie
The Child in the Family