Columbia subject headings:
Harvard subject headings:
Conifers--Canada, Eastern--Identification.
Conifers--Northeastern States--Identification.
Ornamental conifers--Canada, Eastern--Identification.
Ornamental conifers--Northeastern States--Identification.
Princeton subject headings:
Conifers--Canada, Eastern--Identification.
Conifers--Northeastern States--Identification.
Ornamental conifers--Canada, Eastern--Identification.
Ornamental conifers--Northeastern States--Identification.