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This is of course good advice. I would call the USGS value a standard, or
published value rather than an accepted value. Who is it accepted by?
Standard implies that someone or some group decided that the value was to be
used as a standard, but does not imply that it is the gospel truth. I tend
to see red when the phrase accepted value is used. And of course it is
possible for the value to change with time.
John M. Clement
Houston, TX