thought this may be of interest though it's a bit heady, a link to research to determine which continent any oak in question came from - a big issue for US importers. I don't think there's a home version, and it's not clear to me how easy this would be to use in-the-field, say at an entry port by customs. for my interest I just want to know that the oak is what it says it is on the bill of lading. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4924829/