Paul Re: reading a drop board >72 hr. - ~3000, too many to count so counted 2 square inches and extrapolated.
Since you mentioned extrapolation, I thought I'd mention that Calderon published a paper in 1999 on how to count a stickyboard without counting every mite using a method of stratified random sampling. After that paper, Ostiguy and Sammataro published another one in 2000 with an improved sampling method that produced higher accuracy.
https://hal.archives-ouvertes.fr/hal-00891743/document
Bill Hesbach
Cheshire CT
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