I think someone already mentioned Stars of Magic. Close Up Card Magic by Harry Lorayne is a gold mine. Expert Card Technique is great (only 13 bucks!) and Dunbury Dellusion (trick) was worth the price of the book.
Hmm.... Erdnase was published in 1902, which is 108 years back, not 200.
Also, it is a stretch to say that nothing has been improved in between. Card magic has come a long way in the intervening years. This does not mean Erdnase is redundant, but just that you might sometimes find better techniques elsewhere.
In a nutshell, I think Erdnase should mark the beginning of an advanced card man's education and not its end.