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prdh

Posted: 1350488951000
Classification: Query
Can anyone explain what the prdh is? When I am looking at other trees they reference the prdh as their source. Is it a site or a book how do you bring it up?
Posted: 1350574364000
Classification: Query
Not sure the area you are researching - but could it be the PRDH [The Research Program in Historical Demography]- University of Montreal?
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