Earlier quoted context omitted.
What would you suggest?
Card College by Roberto Giobbi is pricey but provides excellent instruction. If you don't mind reading older, more formal language (though not as old as Erdnase!), The Royal Road to Card Magic by Hugard and Braue, and its sequel Expert Card Technique , cover more material than Giobbi at a fraction of the cost, albeit with slightly less attention to the subtleties of finger position.
I second Card College. Absolutely the highest standard in card magic pedagogy.