id	keyword
grbs-15395	ptolemy
grbs-15395	harmonics
grbs-15395	timaeus
grbs-15395	almagest
grbs-15395	roman
grbs-15395	mathematics
grbs-15395	studies
grbs-15395	beginning
grbs-15395	preface
grbs-15395	presentation
grbs-15395	καὶ
grbs-15395	plato
grbs-15395	work
grbs-15395	philosophy
grbs-15395	astronomy