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such violations and if there be any question it is recommended that
reference be made to the basic documents (See references).
It should be noted that direct comparison of the data between
laboratories is very difficult due to differences in times and places
of collection, and in counting.
Further, the samples usually were not
identical but rather of the same type (soil, coconut, water, etc.) and
wide variances have been noted even when samples came from the same
location.
Added difficulties were encountered in transportation such
as possible cross contamination and loss of water from biological
specimen.
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