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In page Spanish missions in California:

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Because virtually all of the artwork at the missions served either a devotional or didactic purpose, there was no underlying reason for the mission residents to record their surroundings graphically; visitors, however, found them to be objects of curiosity.[4] During the 1850s a number of artists found gainful employment as draftsmen attached to expeditions sent to map the Pacific coastline and the border between California and Mexico (as well as plot practical railroad routes); many of the drawings were reproduced as lithographs in the expedition reports.[citation needed]