head first series...

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guys..,do u know bout head-first series book from o'reilly..?? well..i have one of them..my friend gave it to me last month..it was interesting book...the problem is..how could i found the e-book version of these series..??can anyone help me..yesterday.., i went to the official site of the book..there is a bunch of them..but unfortunately,,i dont have a credit card to buy it...there is no bookstore in my town that sell it..