Columbia subject headings:
Authors, German--20th century--Handbooks, manuals, etc.
May, Karl, 1842-1912--Handbooks, manuals, etc.
Harvard subject headings:
Authors, German--20th century--Handbooks, manuals, etc.
May, Karl, 1842-1912--Handbooks, manuals, etc.
Princeton subject headings:
Authors, German--20th century--Handbooks, manuals, etc.
May, Karl, 1842-1912--Handbooks, manuals, etc.