Epiphytic Lichens and Air Pollution in the Netherlands. 1976. (Bibl.Lichenolog.,5). 4 foldg.plates. 228 p. gr8vo. Paper bd. (ISBN 978-3-7682-1059-1)

Introduction/ The Objectives of the When Project/ Considerations concerning the Choice of the Inventory Method/ The Method chosen for the present Survey/ Analysis of the Data/ Application of the Data for a Generalized Map/ Comparison of the Epiphyte Richness with the available Data on Sulphur Dioxide Immission/ Combined Influence of Sulphur Dioxide and other Factors/ Epiphyte Richness in Relation to variousFactors/ Detailed Analysis of Data in the western Parts of the Netherlands/ Comparison and Synthesis of Results obtained with the Use of Squares and of sampling Sites/ Ranking of Species according to Sensitivity/ The Influence of the Phorophyte/ Distribution Maps/Comparison with the Situation around 1950/ Fumigation Experiments/Discussion of the Use of Lichens as Indicators of Air Pollution/References.