In case you want some lore on the Argonians, you might check:
http://www.uesp.net/wiki/Lore:Argonian
http://www.imperial-library.info/content/races-tamriel-argonian
http://www.imperial-library.info/content/pocket-guide-empire-third-edition-war-trees-argonia-and-black-marsh
The reason that you can't really find much written about Argonians and the Black Marsh is probably that they are, of the 10 main races in Tamriel, the one we know less about. Black Marsh seems to be an inhospitable place, that cannot be colonized as the other provinces were because of it's climate an habitat. That, added to the fact that the Argonians don't talk much about themselves and their territory, adds to their classification as a mysterious race. I like them

I am no lore expert, just found this by reading a bit of those articles above. Hope it helps anyway

ps: please Beth, give me a TES VI: Blackmarsh! :tes: