Columbia subject headings:
Climbing plants--North America--Identification.
Shrubs--North America--Identification.
Trees--North America--Identification.
Harvard subject headings:
Climbing plants--North America--Identification.
Plants--United States--Popular works.
Shrubs--North America--Identification.
Trees--North America--Identification.
Princeton subject headings:
Climbing plants--Canada--Identification.
Climbing plants--United States--Identification.
Shrubs--Canada--Identification.
Shrubs--United States--Identification.
Trees--Canada--Identification.
Trees--United States--Identification.