You will find in my trade lists a column that includes an identification code for each country (or cities in the case of Spain) in which the listed species have been collected. Here you have a caption table with the meaning of these codes. Nevertheless you should know that I give a much more detailed description about the place where the specimens requested were collected (area, town, upland, plateau, river, mountain or whichever different available datum about location) when I arrange a shells exchange.