These appendices are intended as a guide to the main sources of commentary and of epidemiological and demographic data for the countries whose cities have been analysed in this book. The work described in chapters 2–6 has been based upon data published in the United States's Weekly Abstract, 1888–1912, cross-checked against selected records of the United Kingdom's registrar general. Accordingly, appendix A lists in detail these primary sources of information. For completeness, the relevant sources are outlined for the entire life of the foreign city tables, 1878–1912.

But we have examined material in detail for only a relatively brief window of time from 1888 to 1912. Accordingly, the sources listed in appendices B–D cover both earlier source material and run through to the present day. Appendix B deals with international sources and appendix C with national sources. Names and addresses of international and national epidemiological agencies responsible for collecting and publishing disease data at these levels appear in appendix D. We do not claim to have been exhaustive in our coverage. Whilst we hope we have captured the most important sources, readers will be able to complement our lists from their own knowledge, and we would be pleased to receive details of such additions.