Columbia subject headings:
Authors, German--19th century--Biography.
Seidel, Heinrich, 1842-1906.
Harvard subject headings:
Authors, German--19th century--Biography
Engineers--Germany--Biography.
Seidel, Heinrich, 1842-1906.
Princeton subject headings:
Authors, German--19th century--Biography.
Engineers--Germany--Biography.
Seidel, Heinrich, 1842-1906.