Columbia subject headings:
Harvard subject headings:
Dialectology.
Languages in contact--Pennsylvania--History--19th century.
Languages in contact--Pennsylvania--History--20th century.
Linguistic change.
Pennsylvania German dialect--History--19th century.
Pennsylvania German dialect--History--20th century.
Pennsylvania German dialect--Influence on English
Princeton subject headings:
Dialectology.
Languages in contact--Pennsylvania--History--19th century.
Languages in contact--Pennsylvania--History--20th century.
Linguistic change.
Pennsylvania German dialect--History--19th century.
Pennsylvania German dialect--History--20th century.
Pennsylvania German dialect--Influence on English.