Columbia subject headings:
Harvard subject headings:
Hertfordshire (England)--History--Sources.
Hertfordshire (England)--Militia--Registers.
Princeton subject headings:
Hertfordshire (England)--History, Military--Sources.
Soldiers--England--Hertfordshire--History--16th century.
Soldiers--England--Hertfordshire--History--17th century.
Soldiers--England--Hertfordshire--Recruiting--Registers.