Letter from Carl Hayden to Robert Fechner on building a Union Chapel in the Grand Canyon.

Letter from Robert Fechner to Carl Hayden on building a Union Chapel in the Grand Canyon.

Letter from Arno B. Cammerer to Carl Hayden on building a Union Chapel in the Grand Canyon.

Letter from Carl Hayden to Walter Mitchell on building a Union Chapel in the Grand Canyon.

Letter from Walter Mitchell to Carl Hayden on building a Union Chapel in the Grand Canyon.

Black and white, wide angle, mounted print taken from the rim with handwritten annotation, "10", circa 1903.

Black and white, wide angle, mounted print taken from the rim with handwritten annotation, "9", circa 1903.

Black and white, wide angle, mounted print taken from the rim with handwritten annotation, "8", circa 1903.

Black and white, wide angle, mounted print with handwritten annotation, "7 Grand Canyon of Colorado River at Bright Angel Trail May-6-03."

Black and white stereograph card of a man sitting on an outcropping and overlooking the canyon. Circa 1879.