I am selling a 13th edition of the book Biology of Microorganisms by authors Madigan, Martinko, Stahl, and Clark (ISBN 978-0-1-5). The book is in great condition and was hardly used. Please note that this is the international version, but the content is exactly identicial to the regular U.S version and all text is in English. The only difference is that this book has a different front cover and it is paperback (which is why it is a lot cheaper than the regular version which is hardcover). I used this book for my microbiology class and had no problem using it instead of the U.S version. The price is $30 plus a $10 shipping fee (I am back at home for the summer so I'm not in the AA area).