KOEBERL, C. & MARTÍNEZ-RUIZ, F. (eds) 2003. Impact Markers in the Stratigraphic Record. Impact Studies Series. xvi + 347 pp. Berlin, Heidelberg, New York: Springer-Verlag. Price Euros 89.95 (+ VAT at local rate), SFr 149.50, £69.00, US 99.00 (hard covers). ISBN 3 540 00630 3 DYPVIK, H., BURCHELL, M. & CLAEYS, P. (eds) 2003. Cratering in Marine Environments and on Ice. Impact Studies Series. xv + 340 pp. Berlin, Heidelberg, New York: Springer-Verlag. Price Euros 79.95 (+ VAT at local rate), SFr 133.00, £61.50, US 109.00 (hard covers). ISBN 3 540 40668 9