by Goswami, S N, Challa, O
Published in The Indian journal of agricultural economics (01.10.2007)

by Challa, O, Kurothe, R. S, Gajbhiye, K. S. (Kothiram Sudam)
Year of Publication 2001

by Challa, O, Prasad, Jagdish
Published in Soil survey horizons (2009)

by Mandal, D.K, Khandare, N.C, Mandal, C, Challa, O., National Bureau of Soil Survey and Land Use Planning, Nagpur (India)
Published in Journal of the Indian Society of Soil Science (01.09.2003)

by Mandal, D.K, Khandare, N.C, Mandal, C, Challa, O., National Bureau of Soil Survey and Land Use Planning, Nagpur (India)
Published in Journal of the Indian Society of Soil Science (01.03.2003)

by Challa, O, Mandal, C
Year of Publication 2005

by Challa, O. (National Bureau of Soil Survey and LAnd Use Planning, Nagpur (India))
Published in Journal of the Indian Society of Soil Science (01.12.1995)

by Maji, A.K, Krishna, N.D.R, Challa, O. (National Bureau of Soil Survey and Land Use Planning, Nagpur (India))
Published in Journal of the Indian Society of Soil Science (01.06.1998)

by Muri, P, Challa, O, McNair, J
Published in 2010 - MILCOM 2010 MILITARY COMMUNICATIONS CONFERENCE (01.10.2010)

by Challa, O. N., McNair, J.
Published in MILCOM 2012 - 2012 IEEE Military Communications Conference (01.10.2012)

by Challa O, Raman K.V
Published in Journal of the Indian Society of Soil Science (1984)

by Goswami, S.N, Challa, O
Published in Indian Journal of Agricultural Economics (2007)

by Challa,O.(National Bureau of Soil Survey and Land Use Planning, Nagpur (India))
Published in Journal of the Indian Society of Soil Science (01.06.1999)

by Chinchmalatpure,A.R, Challa,O, Sehgal,J.(National Bureau of Soil Survey and Land Use Planning, Nagpur (India))
Published in Journal of the Indian Society of Soil Science (01.09.1999)

by Challa,O, Reddy,R.S, Shivaprasad,C.R. (National Bureau of Soil Survey and Land Use Planning, Nagpur (India))
Published in Agropedology (India) (01.06.1999)

by Mandal D.K, Challa O, Roy Chowdhury C
Published in The Indian journal of agricultural sciences (1989)

by Hakare, T.N, Mandal, D.K, Challa, O., National Bureau of Soil Survey and Land use Planning, Nagpur (India)
Published in Journal of Maharashtra Agricultural Universities (India) (01.01.2003)

by Challa, O, Raman, K.V, Raman, S
Published in Journal of the Indian Society of Soil Science (1985)

by Nair, K.M, Challa, O, Deshmukh, S.N
Published in Van vigyan (1987)

by Mandal, D.K, Challa, O, Roy Chowdhury, C. (National Bureau of Soil Survey and Land Use Planning, Nagpur (India))
Published in The Indian journal of agricultural sciences (01.01.1989)