> Multivolume work
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Teacher's book:
The German-Americans - an invisible minority? Teacher's book comp. and ed. by Erwin Helms
Paderborn: Schöningh, 19XX-
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Pupil's book:
The German-Americans - an invisible minority? Pupil's book comp. and ed. by Erwin Helms
Paderborn: Schöningh, 19XX-