I'm looking for the current release of the FAA's Instrument Procedures Handbook. The FAA website for the IPH shows FAA-H-8083-16, but other FAA documentation I've found references FAA-H-8261-1A. I've looked for places to buy the Instrument Procedures Handbook such as Amazon and found that they're offering FAA-H-8261-1A.
Which one is current?
For future reference, how do I found the most recent release of an FAA publication?