id	keyword
american_scientific_journal-2909	soil
american_scientific_journal-2909	temperature
american_scientific_journal-2909	cone
american_scientific_journal-2909	cpt
american_scientific_journal-2909	depth
american_scientific_journal-2909	engineering
american_scientific_journal-2909	figure
american_scientific_journal-2909	friction
american_scientific_journal-2909	penetration
american_scientific_journal-2909	resistance
american_scientific_journal-2909	permafrost