Columbia subject headings:
Botany--Massachusetts--Concord--Indexes.
Botany.
Thoreau, Henry David, 1817-1862--Knowledge and learning.
Thoreau, Henry David, 1817-1862. Journal--Indexes.
Harvard subject headings:
Botany--Massachusetts--Concord--Indexes.
Thoreau, Henry David, 1817-1862--Knowledge--Botany.
Thoreau, Henry David, 1817-1862. Journal--Indexes.
Princeton subject headings:
Botany--Massachusetts--Concord--Indexes.
Thoreau, Henry David, 1817-1862--Knowledge--Botany.
Thoreau, Henry David, 1817-1862. Journal--Indexes.