[Q] Stock ROM translation topic

So I just got a Nexus One and I was hoping to download a stock ROM for each Android version it went through. So I went to http://shipped-roms.com/index.php?ca...0(Nexus%20One) but I cant figure out what the names mean. Can anyone help out with this?

I what I need is pretty much which is the ROM (most updated version) with Android 2.1, 2.2 etc.