The Mediterranean Islamic slave trade out of Africa: A tentative census

@inproceedings{Austen1992TheMI,
  title={The Mediterranean Islamic slave trade out of Africa: A tentative census},
  author={Ralph A. Austen},
  year={1992}
}
Process for the prevention of frost heaves in fine-grained soils comprising the insertion of a large-pored filter layer which is protected on its upper and lower sides by a permeable, rot-proof web of fabric, felt or fleece.