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Keywords:Arizona, Route 66, arid, ballast, barren, blue sky, clear sky, daytime, desert, desolate, dry, earth, expanses, formation, geological formation, geology, gravel, hills, horizon, horizon line, landscape, minimalist, mountains, natural beauty, natural landmark, nature, open space, outback, outdoors, peaceful, railroad tracks, railway, remote, rocky terrain, rugged, rural, scenic, scrubland, serene, simplicity, sparse vegetation, sunlight, track bed, train tracks, tranquil, transportation, travel, untouched, vast, wilderness
