Notes on Walt Whitman as Poet and Person. 1867.
Wake Robin. 1871.
Winter Sunshine. 1875.
Birds and Poets. 1877.
Locusts and Wild Honey. 1879.
Pepacton. 1881.
Fresh Fields. 1884.
Signs and Seasons. 1886.
Indoor Studies. 1889.
Riverby. 1894.
Whitman, a Study. 1896.
The Light of Day. 1900.
Squirrels and Other Fur Bearers. 1900.
Literary Values. 1904.
Far and Near. 1904.
Ways of Nature. 1905.
Bird and Bough. 1906. (Poems.)
Camping and Tramping with Roosevelt. 1907.
Leaf and Tendril. 1908.
Time and Change. 1912.
The Summit of the Years. 1913.
The Breath of Life. 1915.
Under the Apple Trees. 1916.
Field and Study. 1919.
Accepting the Universe. 1920.
My Boyhood: An Autobiography. 1922.