000018834 001__ 18834
000018834 005__ 20190715162317.0
000018834 040__ $$aCH-GeUNH$$beng
000018834 1102_ $$aOpen Education Centre (Bulgaria)
000018834 24514 $$aThe children of Sofia
000018834 2602_ $$aSofia:$$bOpen Education Centre,$$c[s.d.]
000018834 546__ $$aEnglish
000018834 650_4 $$aSECONDARY SCHOOL STUDENTS
000018834 650_4 $$aTEACHING/TRAINING GUIDES
000018834 650_4 $$aURBAN ENVIRONMENT
000018834 651_4 $$aBULGARIA
000018834 852__ $$aOHCHR$$bHRE$$hHRE/EUR/BGR/1
000018834 980__ $$aHRE Collection
000018834 985__ $$aBOOK
000018834 987__ $$aTeaching materials, manuals