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Details of plant population biology from repeat photography: (a) saguaro cactus in MacDougal Crater,

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Details of plant population biology from repeat photography: (a) saguaro cactus in MacDougal Crater, Sonora, Mexico, in 1959, (b) same scene in 1984, and (c) in 1998. By 1998, the two cactus in the foreground of the 1959 photo had died and fallen.
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