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	1.	Geomagnetic K-indices, international polar year, August 1932 to August 1933 edited by Julius Bartels by International Association of Geomagnetism and Aeronomy Bartels, Julius, ed Series: International Association of Terrestrial Magnetism and Electricity Bulletin; No. 12d Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington, D. C. International Union of Geodesy and Geophysics 1950 Availability: Items available for loan: Mumbai (1)Call number: 550.38/IAGA. Place hold
	2.	Encyclopedia of physics v. XLIX/1, geophysics III, part I edited by Siegfried Flugge and Julius Bartels by Flugge, Siegfried, ed.Bartels, Julius, ed Material type: Text; Format: print ; Literary form: Not fiction Publication details: Berlin Springer Verlag 1961 Availability: Items available for loan: Mumbai (1)Call number: 53(03)/FLU. Place hold
	3.	Encyclopedia of physics v. XLVIII, geophysics II edited by Siegfried Flugge and Julius Bartels by Flugge, Siegfried, ed. Bartels, Julius, ed Material type: Text; Format: print ; Literary form: Not fiction Publication details: Berlin Springer Verlag 1957 Availability: Items available for loan: Mumbai (1)Call number: 550.3(03)/FLU. Place hold
	4.	Encyclopedia of physics v. XLVII, geophysics I edited by Siegfried Flugge and Julius Bartels by Flugge, Siegfried, ed. Bartels, Julius, ed Material type: Text; Format: print ; Literary form: Not fiction Publication details: Berlin Springer Verlag 1956 Availability: Items available for loan: Mumbai (1)Call number: 550.3(03)/FLU. Place hold