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A means of indicating position, usually expressed either as double letters or as code words that are established in operation orders or by other means. ...
The standardized birth ratio adjusted for the reference geographic zone and calendar time period was 1.07 and 1.28 in the low and high (>0.3 mg/L) boron ...
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Dec 15, 1999 ... World Geographic Reference System Index; These 15 degree areas are further divided into one degree units identified by 15 characters. ...