Columbia subject headings:
Animals--Identification.
Botany--North America--Handbooks, manuals, etc.
Natural history--North America--Handbooks, manuals, etc.
Wetland ecology--North America--Handbooks, manuals, etc.
Wetland plants--North America--Identification.
Zoology--North America--Handbooks, manuals, etc.
Harvard subject headings:
Animals--Identification.
Botany--North America--Handbooks, manuals, etc.
Natural history--North America--Handbooks, manuals, etc.
Wetland ecology--North America--Handbooks, manuals, etc.
Wetland plants--North America--Identification.
Zoology--North America--Handbooks, manuals, etc.
Princeton subject headings: