Columbia subject headings:
Afrikaans language--Dictionaries--English.
English language--Dictionaries--Afrikaans.
Geology--Dictionaries--Afrikaans.
Geology--Dictionaries.
Harvard subject headings:
Afrikaans language--Dictionaries--English.
English language--Dictionaries--Afrikaans
Geology--Dictionaries--Afrikaans.
Geology--Dictionaries--English.
Princeton subject headings:
Afrikaans language--Dictionaries--English.
Dictionaries.
English language--Dictionaries--Afrikaans.
Geology--Dictionaries--Afrikaans.
Geology--Dictionaries.