id	keyword
american_scientific_journal-6236	delta
american_scientific_journal-6236	niger
american_scientific_journal-6236	journal
american_scientific_journal-6236	occurrence
american_scientific_journal-6236	species
american_scientific_journal-6236	miocene
american_scientific_journal-6236	american
american_scientific_journal-6236	middle
american_scientific_journal-6236	nigeria
american_scientific_journal-6236	formation
american_scientific_journal-6236	technology
american_scientific_journal-6236	sciences
american_scientific_journal-6236	research