Almanac pages are a type of collectible in Assassin’s Creed III that are reminiscent of the renegade orbs in crackdown 2. If you haven’t played that, well the gist of these pages is that they will not sit in one spot, but instead will force you to chase them down and catch them, usually across some difficult to traverse terrain and forcing you to use all of your free running prowess in the process!
The almanac pages can be used at the homestead to create inventions required to complete the game at 100% synchronization, so if you want to complete the game in its entirety, you are going to have to track these bad boys down.
There are 36 almanac pages in total and they can be found in the two major cities with 20 being available for pick up in Boston and a further 16 scattered around New York.
Note that these will appear on your map after using view points, if you come into close proximity to one or by purchasing a map with all their locations from one of the general stores.
With out any further preamble, here is where you can find them:
North Boston (6 Pages)
Central Boston (11 Pages)
South Boston (3 Pages)