The impact factor for Acta Palaeontologica Polonica was calculated on the basis of a citation
database provided by the Institute for Scientific Information in Philadelphia. It appears
that APP is improving its position within the group of leading international palaeontological
periodicals, with IF increasing from 0.167 in 1992 to 0.576 in 1997. APP is the only Earth
Sciences representative among 35 Polish journals included in the IS1 citation database