id	keyword
american_scientific_journal-1906	mature
american_scientific_journal-1906	sequence
american_scientific_journal-1906	data
american_scientific_journal-1906	maturity
american_scientific_journal-1906	vitrinite
american_scientific_journal-1906	samples
american_scientific_journal-1906	zone
american_scientific_journal-1906	albian
american_scientific_journal-1906	generation
american_scientific_journal-1906	oil
american_scientific_journal-1906	values
american_scientific_journal-1906	tmax