Birla Institute of Technology and Science, Pilani, Available Volumes: Vol.22-25,1971-74 Punjab Agricultural University, Ludhiana, Available Volumes: Vol.22-25,1970-1974 Panjab University, Chandigarh, Available Volumes: Vol.10-11,1958-1960 Punjab Agricultural University, Ludhiana, Available Volumes: Vol.1-4,1974-1976
