id	keyword
american_scientific_journal-541	metals
american_scientific_journal-541	soil
american_scientific_journal-541	dairy
american_scientific_journal-541	lead
american_scientific_journal-541	animal
american_scientific_journal-541	cadmium
american_scientific_journal-541	arsenic
american_scientific_journal-541	health
american_scientific_journal-541	toxicity
american_scientific_journal-541	concentrations
american_scientific_journal-541	feed
american_scientific_journal-541	products
american_scientific_journal-541	human
american_scientific_journal-541	journal