@book{ Solr-9043005, title = {Bolgarii͡a.}, editor = {Soviet Union. Sovetskai͡a Armii͡a. Generalʹnyĭ shtab}, address = {Moscow}, publisher = {Generalʹnyĭ shtab}, year = {1983}, note = {Soviet military topographic set covering Bulgaria and portions of adjacent countries.}, note = {Relief shown by contours and spot heights. Depths shown by bathymetric isolines and soundings on some sheets.}, url = {http://www.lib.uchicago.edu/e/collections/maps/indexes/G6890-s50-S6-index.jpg} }