@book{ 0-521083249, title = {State security and mapping in the GDR: map falsification as a consequence of excessive secrecy? ; Lectures to the conference of the BStU from 8th - 9th March 2001 in Berlin}, series = {Archiv zur DDR-Staatssicherheit}, author = {Unverhau, Dagmar}, editor = {Unverhau, Dagmar}, address = {Berlin}, publisher = {LIT}, year = {2006}, isbn = {9783825890391}, isbn = {3825890392}, language = {English}, note = {Literaturangaben}, url = {https://swbplus.bsz-bw.de/bsz254969151inh.htm}, url = {https://katalog.ub.tu-freiberg.de/Record/0-521083249} }