id	keyword
american_scientific_journal-1612	oil
american_scientific_journal-1612	trace
american_scientific_journal-1612	vol
american_scientific_journal-1612	oils
american_scientific_journal-1612	metals
american_scientific_journal-1612	samples
american_scientific_journal-1612	determination
american_scientific_journal-1612	journal
american_scientific_journal-1612	absorption