Dewey navigator | Istituto Italiano di Cultura, Los Angeles

Select a description to see subdivisions

Code	Description	Items
520	Astronomy & allied sciences	3
521	Celestial mechanics	1
522	Techniques, equipment, materials	0
523	Specific celestial bodies & phenomena	1
525	Earth (Astronomical geography)	0
526	Mathematical geography	0
527	Celestial navigation	0
528	Ephemerides	0
529	Chronology	0