Columbia subject headings:
Highgate Horticultural Society--History.
Horticulture--Societies, etc.
Harvard subject headings:
Highgate (London, England)--History.
Highgate Horticultural Society--History.
Horticulture--Societies, etc.
Princeton subject headings:
Highgate Horticultural Society--History.
Horticulture--England--Societies, etc.