Channel changes in the Bhagirathi–Hugli near Kalna between 1967 and 1979. Source: 1967: Corona KH4A image # DS1038-2102DA179; 1968–69: SoI Map # 79A07-08; 1972: Landsat-1 MSS image of path 149, row 44; 1979: Corona KH9-15 image # DZB1215-500298L006001