[CQ-Contest] IARU standard log format: where described?

[psoper@encore.com (Pete Soper)]

In the writeup of the Russian DX contest are log submission
instructions that include in part: 

LOG: Separate for each band (the IARU standard log OK).

Could somebody point me to a description of the "IARU standard log" format?

Regards,
Pete
KS4XG

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