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	1.	No cover image available Statistical inference / Helen M. Walker and Joseph Lev by Walker, Helen M. (Helen Mary), 1891- Lev, Joseph, 1903- Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Calcutta : IBH Pub., 1965 Availability: Items available for loan: National Library of India (1)Call number: E 519.9 W 152. Place hold Request article Save to lists
	2.	No cover image available Elementary statistical methods / Helen Mary Walker by Walker, Helen Mary, 1891- Lev, Joseph, 1903- [aut] Edition: Rev. ed. Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: New York : Holt Rinehart and Winston, 1958 Availability: Items available for loan: National Library of India (1)Call number: E 311.2 Db 9797. Place hold Request article Save to lists

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