I would recommend a newer version as that is over 35 years old. I realize it's going to be less expensive, but it will only cover what was known AT THAT TIME through probably 1978 or 1979, with nothing afterwards. The pricing will be off as well, as that was the height of the market and prices have changed dramatically since.
I recommend either getting the latest version from the United States Stamp Society (you can find them on-line) or a more recent version (2010 or later) on
ebay.
Hope this helps.