GRAIN-SIZE INDICES,CLASSIFICATION AND ENVIRONMENT.DOEGLAS DJ.1968; SEDIMENTOLOGY; NLD; 1968(3), VOL. 10, NUM. 0002, P. 83 A 100Miscellaneous

Q1MDQ3 INDICES SHOWING GRAIN-SIZE DISTRIBUTION ON MAPS.DOEGLAS DJ.1971; GEOL. EN MIJNBOUW; NLD; 1971(6), VOL. 50, NUM. 0003, P. 367 A 372Miscellaneous

PROGRESS IN SEDIMENTOLOGY IN THE NETHERLANDSDOEGLAS DJ; NOTA DJG.1960; WORLD.PETROL.CONGR.; 1960, P. 134 A 137Miscellaneous