N. Gregory Mankiw
wrote Macroeconomics EconPortal 6-month Access Code
comprising pages back in 2012.
Textbook and eTextbook are published under ISBN 1464105138 and 9781464105135.
Since then Macroeconomics EconPortal 6-month Access Code textbook
was available to sell back to BooksRun online for the top buyback price
or rent at the marketplace.
6-month access code for Econ Portal. Goes with Macroeconomics, 8th edition, by N. Gregory Mankiw. The access code has not been scratched off and is still unused, but the perforated edge has been opened. I opened it thinking that it was the correct access code but it ended up being for the wrong website.