Columbia subject headings:
Harvard subject headings:
German language--Foreign elements--Polish
German language--Phonology, Comparative--Polish.
German language--Study and teaching--Polish speakers
German language--Vowels.
Polish language--Foreign elements--German
Polish language--Phonology, Comparative--German.
Polish language--Study and teaching--German speakers
Polish language--Vowels.
Princeton subject headings:
German language--Foreign elements--Polish.
German language--Phonology, Comparative--Polish.
German language--Study and teaching--Polish speakers.
German language--Vowels.
Polish language--Foreign elements--German.
Polish language--Phonology, Comparative--German.
Polish language--Study and teaching--German speakers.
Polish language--Vowels.