id	keyword
american_scientific_journal-1746	quarrying
american_scientific_journal-1746	area
american_scientific_journal-1746	journal
american_scientific_journal-1746	vegetation
american_scientific_journal-1746	activities
american_scientific_journal-1746	study
american_scientific_journal-1746	state
american_scientific_journal-1746	land
american_scientific_journal-1746	pit
american_scientific_journal-1746	cover
american_scientific_journal-1746	sciences
american_scientific_journal-1746	technology
american_scientific_journal-1746	engineering
american_scientific_journal-1746	research