id	keyword
american_scientific_journal-2926	seedling
american_scientific_journal-2926	leucocephala
american_scientific_journal-2926	metals
american_scientific_journal-2926	growth
american_scientific_journal-2926	treatment
american_scientific_journal-2926	lead
american_scientific_journal-2926	germination
american_scientific_journal-2926	cadmium
american_scientific_journal-2926	ppm