OFFICIAL USE ONLY 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. OFFICIAL USE ONLY