Birla Institute of Technology and Science, Pilani, Available Volumes: Vol.235-46,1972-73 University of Hyderabad, Hyderabad, Available Volumes: Vol.229-240, 1971-19722 University of Kerala, Thiruvanathapuram, Available Volumes: Vol.242-246,1973 Punjab Agricultural University, Ludhiana, Available Volumes: Vol.238-245,1972-1973
