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- [22] INVESTIGATIONS ON CARCINOGENIC BURDEN BY AIR-POLLUTION IN MAN .9. EARLY PATHOLOGICAL ALTERATIONS OF BRONCHIAL EPITHELIUM IN SYRIAN GOLDEN-HAMSTERS AFTER INTRATRACHEAL INSTILLATION OF BENZO(A)PYRENE .1. MORPHOLOGICAL STUDIES FROM SEMITHIN SECTIONS ZENTRALBLATT FUR BAKTERIOLOGIE MIKROBIOLOGIE UND HYGIENE SERIE B-UMWELTHYGIENE KRANKENHAUSHYGIENE ARBEITSHYGIENE PRAVENTIVE MEDIZIN, 1974, 159 (5-6): : 493 - 502