[ON THE PROBLEM OF THE PERMISSIBLE CONTENT OF WOOD PULP IN PAPER FOR SCHOOL TEXTBOOKS].
D001877:Books; D006801:Humans; D010209:Paper; D012574:Schools; D014934:Wood
BOOKS; PAPER
K VOPROSU O DOPUSTIMOM SODERZHANII DREVESNO I MASSY V BUMAGE SHKOL'NYKH UCHEBNIKOV.