There is a trustworthy website I can offer it is entitled: http://www.mta.info/nyct/maps/submap.htm This is a trustworthy site because it is the official New York subway map website. This map is clear, detailed and color coordinated which is useful.
MTA Subway Maps have limited information about major landmarks. Many landmarks are not shown, however, and you would be aided by referencing other maps along with the subway map.
You can just go to mta.com and you will find maps for wherever you are going just click on the link that best suite you. Find different MTA maps on this site.
There are several sites online that provide a map that one can use. Example of this is the official MTA map that shows all the subway routes in New York City.
New York City Subway, or just the subway, or MTA.
the MTA.
21 years of maps, eh? You won't be able to get them from the MTA. They would only have the latest editions. The NY Transit Museum also does not have any old maps for sale. You may want to try an online auction site like ebay. I saw a 1996 map available there fro $1.00 as a starting bid with a $5.00 "buy it now". (Don't forget that there will be a mailing cost on top of that). If you know of anyone who is a subway buff/railfan, maybe they'd have some extras they would be willing to part with (for a price).
They are available all over the city and in some subway terminals for free. Best bet is to find a book store (there are Barnes & Nobles all over the city) where you can buy different versions of subway maps for under $10. Maps are also imprinted on umbrellas and other items at the MTA store in Grand Central and at Bed, Bath & Beyond. Tourists shops often carry items like this as well. Another free option is to print it yourself from the MTA web site (there's a PDF of the map there).
No
California, Utah, Mississippi, Kansas, New Mexico, Tennessee, and Michigan.
Interboro Rapid Transit was one of the subway lines used in the old days. Now it is simply called MTA. All the other lines such as BMT, IND were merged into the MTA.
Just get a subway map. At grand Central, they have a MTA store with free maps.
I think it was in 1869, but it was not MTA service at the time