00468nam a2200133Ia 4500008004100000040001700041082002400058100002500082110007000107245005300177260002700230300001800257650005900275190327s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta551.46bN277D  aNair, N Balakrishnan  aNational Council of Educational Research and Training (New Delhi) 4aThe Discovery of the oceanscN Balakrishnan Nair  aNew DelhibNCERTc1969  axv, 183p: ill  aOceanography; Underwater exploration; Ocean; Sea water