id	keyword
american_scientific_journal-3275	rock
american_scientific_journal-3275	strength
american_scientific_journal-3275	samples
american_scientific_journal-3275	quartzite
american_scientific_journal-3275	durability
american_scientific_journal-3275	engineering
american_scientific_journal-3275	dolomite
american_scientific_journal-3275	marble
american_scientific_journal-3275	test
american_scientific_journal-3275	formation
american_scientific_journal-3275	gneiss
american_scientific_journal-3275	augen