1. Literature on pollen-statistics and related topics published 1937–1939
2. Erdtman , G. 1943.An Introduction to Pollen Analysis, Edited by: Verdoorn , F. 239Waltham, Mass.: Chronica Botanica Company. (about 500 original illustrations; a definite figure cannot be given as the author has not yet received a copy of the book). The chapters are as follows: I. Introduction. II. Chemistry of peat (by Dr H. Erdtman). III. Pollen preparations. IV. Preparation of fossil pollen-bearing material. V. Pollen and spore morphology (terminology; pollen diagnoses). VI. Pollen morphology (Monocotyledons). VII, VIII. Pollen morphology (Dicotyledons). IX. Pollen morphology (Gymnosperms). X. Spore morphology (Pteridophyta and Bryophyta). XI. Pollen Analyses and their graphical representation. XII. Correlations. XIII. Output and dissemination of pollen. XIV. Surface samples. XV. Pollen flora of peat samples. XVI. Geographical survey. XVII. Tertiary deposits. XVIII. Pollen analysis of honey and drugs
3. Ueber den Pollen der Pflanzen und das Pollenin