na INLIS000000000024281 Ind 0010-1218006119 Autoflourescence of fossil pollen and spores with special reference to age determination and coalification GIJZEL, Pieter van Pieter van Gijzel Leiden J.J. Groen Zoon 1928 317 p. : ill. ; 29 cm. 317 p. : ill. ; 29 cm. 561.2/.3GIJa Thesis(Doctor)-Universiteit te Leiden, 1928.-- Bibl.: p. 314-317 561.2/.3 POLLEN SPORES FLOURESCENCE mfn-26136