1. Index to Bangladesh 1:50,000 topographic maps, 1959-2005 Maps University Of California Berkeley Public content 1959. Land Info (Firm), Sārve aba Bāṃlādeśa, and Survey of Bangladesh. This index provides access to a set of digital versions of print source map sheets from the topographic map series Bangladesh 1:50,000. There is co... Land Info (Firm).