Hello Where can I find accurate sales figures of titles released for the NES platform? I'm trying to find the number of units that both 'The Legend of Zelda' and 'Zelda 2: The Adventure of Link' have sold. I've tried looking in most the obvious places but all I have been able to find is a figures published by Nintendo that states the overall number of units sold under the Zelda brand.

Generally those figures cost money; you need to buy them from firms who specialize in tracking that kind of information. Alternatively, publishers may or may not release sales figures in their quarterly/annual/et cetera reports; I'm not sure whether or not Nintendo does, but since you're asking about titles that are pretty old, it's not likely you'll find the information online.