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air sampling technique references

First, I need to apologize for not thanking everyone who responded to my
question about path length. The responses were very helpful and informative.
Thank you all very much.

I have another question now regarding references for good practices in air
sampling. I am particularly interested in references addressing when to take
"grab" samples and large volume samples and guidelines for what constitutes
a "grab" sample or a "routine" sample.

Gary Damschen