The index of geographical names (trefwoordenregister) contains (bestaat uit) references (verwijzingen) to maps on which you can find information about topics. The name and card number of each card is given. For example, you search for information about "earthquakes" in this index, you can see that information can be found on the following maps:
Earth on pages 188-189 / 170-171 and 192D and 174D
Japan on the cards 157B / D or 140B / D
Turkey on map 123A or 115A and 126D