BibSlavKon: 43 hits for M6700 on page 5

The Bibliography of International Congresses of Slavists (1929-2018) was converted from thirteen printed volumes into a database in cooperation with the Slavonic Library in Prague (Slovanská knihovna Praha) and contains 8550 records. Since 2008 the Bibliography appear only in electronic form and will be updated in five-year interval according to the next Congresses of Slavists. The further information can be found here. The overview of the classification can be found: here.

Your search for M6700 provides 43 hits
41	Osvoboditeľnaja bor’ba jugoslavjanskich narodov Avstro-Vengrii v gody Pervoj mirovoj vojny i raspad monarchii Gabsburgov Pisarev, Ju. A. - Istorija, kuľtura, etnografija i foľklor slavjanskich narodov (1973), 115-124
42	Osvoboditeľnaja bor’ba slavjanskich narodov Centraľnoj i Jugo-Vostočnoj Jevropy v gody Vtoroj mirovoj vojny i koncepcii obščestvennopolitičeskogo razvitija Gibianskij, L. Ja.; Muraško, G. P.; Parsadanova, V. S. - Istorija, kuľtura, etnografija i foľklor slavjanskich narodov (1973), 52-72
43	Materialy k istorii pis’mennosti slovackich seľskochozjajstvennych gorodkov (oppiduum’ov) komitata Požon’ : (na osnove dokumentov urbarskoj reguljacii pri Marii Terezii) Udvari, István - Studia slavica Academiae scientiarum hungaricae 38 (1993) 1/2, 203-219

Bibliography of International Congresses of Slavists (BibSlavKon)

Osvoboditeľnaja bor’ba jugoslavjanskich narodov Avstro-Vengrii v gody Pervoj mirovoj vojny i raspad monarchii Gabsburgov

Osvoboditeľnaja bor’ba slavjanskich narodov Centraľnoj i Jugo-Vostočnoj Jevropy v gody Vtoroj mirovoj vojny i koncepcii obščestvennopolitičeskogo razvitija

Materialy k istorii pis’mennosti slovackich seľskochozjajstvennych gorodkov (oppiduum’ov) komitata Požon’ : (na osnove dokumentov urbarskoj reguljacii pri Marii Terezii)