| Roundness and shape of marine gravels from Urk (Netherlands), a comparison of several methods of investigation |
| van Andel, Tj. H.; Wiggers, A.J.; Maarleveld, G. (1954). Roundness and shape of marine gravels from Urk (Netherlands), a comparison of several methods of investigation J. Sediment. Petrol. 24(2): 100-116 |
| In: Journal of Sedimentary Petrology. Society of Economic Paleontologists and Mineralogists (SEPM): Tulsa. ISSN 0022-4472, meer |
|
