00651nam a22002171 4500 4539527 BD-DhUL 20191020095618.0 700914s1968 ne a b 000 0 eng 68016562 Ne*** DLC DLC DLC BD-DhUL 551.3 ALC Allen, John R. L. Current ripples : their relation to patterns of water and sediment motion / by John R. L. Allen. Amsterdam : North-Holland Pub. Co., c1968. xiii, 433 p. : ill. ; 27 cm. Bibliography: p. [415]-422. Ripple-marks. ddc BK 250406 250406 0 0 ddc 0 551_300000000000000_ALC 0 NFIC 381210 DUSL DUSL GEN 2019-10-20 Purchased 551.3 ALC A188170 2019-10-20 2019-10-20 BK