Katharine Lee Bates wrote three versions (differences underlined).

(1) The first version published in The Congregationalist (weeekly journal), July 4, 1895:

O beautiful for halcyon skies,
For amber waves of grain,
For purple mountain majesties
Above the enameled plain!
America! America!
God shed his grace on thee
Till souls wax fair as earth and air
And music-hearted sea!

O beautiful for pilgrims feet,
Whose stern impassioned stress
A thoroughfare for freedom beat
Across the wilderness!
America ! America !
God shed his grace on thee
Till paths be wrought through wilds of thought
By pilgrim foot and knee!

O beautiful for glory-tale
Of liberating strife,
When once and twice, for man's avail,
Men lavished precious life!
America! America!
God shed his grace on thee
Till selfish gain no longer stain
The banner of the free!

O beautiful for patriot dream
That sees beyond the years
Thine alabaster cities gleam
Undimmed by human tears!
America! America!
God shed his grace on thee
Till nobler men keep once again
Thy whiter jubilee!

(2) Revised version in 1904:

O beautiful for spacious skies,
For amber waves of grain,
For purple mountain majesties
Above the fruited plain!
America! America!
God shed his grace on thee
And crown thy good with brotherhood
From sea to shining sea!

O beautiful for pilgrim feet
Whose stern, impassioned stress
A thoroughfare for freedom beat
Across the wilderness!
America! America!
God mend thine every flaw,
Confirm thy soul in self-control,
Thy liberty in law!

O beautiful for glory-tale
Of liberating strife.
When valiantly, for man's avail,
Men lavished precious life!
America! America!
May God thy gold refine
Till all success be nobleness
And every gain divine!

O beautiful for patriot dream
That sees beyond the years
Thine alabaster cities gleam
Undimmed by human tears!
America! America!
God shed his grace on thee
And crown thy good with brotherhood
From sea to shining sea!

(3) The final version in 1911:

O beautiful for spacious skies,
For amber waves of grain,
For purple mountain majesties
Above the fruited plain!
America! America!
God shed His grace on thee
And crown thy good with brotherhood
From sea to shining sea!

O beautiful for pilgrim feet,
Whose stern, impassioned stress
A thoroughfare for freedom beat
Across the wilderness!
America! America!
God mend thine every flaw,
Confirm thy soul in self-control,
Thy liberty in law!

O beautiful for heroes proved
In liberating strife,
Who more than self their country loved,
And mercy more than life!
America! America!
May God thy gold refine
Till all success be nobleness
And every gain divine!

O beautiful for patriot dream
That sees beyond the years
Thine alabster cities gleam
Undimmed by human tears!
America! America!
God shed His grace on thee
And crown thy good with brotherhood
From sea to shining sea!

--SOURCE: Lynn Sherr, America the Beautiful: The Stirring True Story Behind Our Nation's Favorite Song (Public Affairs, 2001, p. 75)