DUBCEK CAUTIONS RIOTS MAY BRING NEW SOVIET MOVE; He Warns the Czechoslovaks of 'Tragic Consequences' From Further Incidents
Dubcek, in TV s, appeals for confidence and discipline, warns of 'tragic consequences' if Czechs again engage in anti-Soviet violence, says period for normalization is not unlimited; clearly implies threat of return of Soviet tanks; tries to assure Czechs that liberalization program is not forgotten; pledges gradual implementation; press and TV, under new censorship rules, carry repts of support for Presidium statement; Dubcek illus
