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- [2] Deep boulder-clay beds of a latter glacial period in North-Holland. PROCEEDINGS OF THE KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN TE AMSTERDAM, 1904, 6 : 340 - 345
- [3] CLAY MINERAL FORMATION IN DIFFERENT ROCK TYPES OF A WEATHERING BOULDER CONGLOMERATE SOIL SCIENCE SOCIETY OF AMERICA PROCEEDINGS, 1967, 31 (05): : 627 - +