Acknowledgements
I would like to thank the following people: Henk Hiddink (ACVU-HBS) for his patience and information in response to my questions about finds from wells; Laura Kooistra (BIAX Consult) for information on Roman ladders and other wooden objects; Lourens van de Feijst (ADC Archeoprojecten), Hans Siemons (Hazenberg Archeologie), Jan van Renswoude (ACVU-HBS) and Henk Hiddink (ACVU-HBS) for their permission to use photographs from their publications; and finally, the editor Leendert Louwe Kooijmans and two reviewers for their useful comments on the manuscript.
Review data:
Submission 3/6/2009
Revision 8/9/2009
2nd submission 25/9/2009