This story originally published in the July 1954 issue of National Geographic magazine and has been put online as part of our From the Vault series. See more digitized stories from our archives here.
1 - Persons 65 years and over. 2 - Persons under 18 years. 3 - Persons 15 years and over. Disability-related estimates are produced using a different weighting methodology and comparisons with ...
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