Re: Which is the easiest way to find things?
I think it depends on the geographic abilities of the person doing the searching. If you are looking for Chad or Pakistan or Qatar and you don't know where it is, then alphabetically is easiest, else by region and then alphabetically is easier. If we are tracking a dynamic situation, like an outbreak of flu or RVF, starting with the seminal country, and then following with the 2ndary outbreaks may help in organizing the new information into a rapidly changing scenario. After the initial flood of changing info, the regional orientation would probably prove most useful.
An example of the latter case is the outbreak of H5N1 in the Nile delta. Initially all the outbreaks were considered more or less individually. Later they were grouped by political designation within the Nile delta. As the outbreaks expanded, the outbreaks in the Nile delta were lumped together and then outbreaks in neighboring areas, e.g., below Cairo, etc., were included. In this way, readers were acquainted with the geographic spread in a way which facilitated the incorporation of new information into existing knowledge while highlighting the progression of outbreaks.