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1966

Horizontal Strata. Soda Canyon, Colo.

Physical Atlas

Horizontal Strata. Soda Canyon, Colo.

1966

Horizontal Strata. Bright angel Ariz.

Physical Atlas

Horizontal Strata. Bright Angel Ariz.

1966

Horizontal Strata. Zion National Park, U …

Physical Atlas

Horizontal Strata. Zion National Park, U …

1966

Horizontal Strata. Bryce Canyon national …

Physical Atlas

Horizontal Strata. Bryce Canyon National …