This is the fourth in a series of reports made after annual examinations of 10 boxes and their contents returned from each of 4 outdoor exposure sites.nResults of this fourth-year examination indicate that, of the three species of pretreated wood considered for use as boxes, Douglas-fir best protected the liner and its contents, and red oak was the least effective. The liner of polyethylene film, foil, and scrim was still superior to the liners consisting of polyethylene film and kraft paper combinations. Of the four sites, Panama's high temperature and moisture had the most detrimental effect on boxes, liners, and contents.
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