Events are rarely listed on documents in the order in which they took place. Chronologies have been discussed in "Tip of the Day" before, but the suggestion bears repeating. When I was reviewing settlement dates on Bureau of Land Management tract books, I didn't notice settlement trends as easily as when I started putting the dates in chronological order.
The books are organized geographically for understandable reasons. Chronological order makes it easier to notice trends that geographical organization tends to hide.