This estimate is based on examination on the census microfilm of approximately 500 elderly people residing without children randomly selected from the 1860 sample.
With the requirement of periods allowing a liquid microfilm of water formed around the cell metabolism and degradation of various substances can take place.
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Microfilm records were then reviewed to determine whether the victim was a child (age 11 years or under).
The second figure has been redrawn on the basis of a microfilm reproduction of the original manuscript.