The following partial list of booksellers may be useful in finding books in print and out-of-print. We are not affiliated with any of these sellers.
Abebooks.com - used, rare, and out-of-print books.
Barnes and Noble - in and out-of-print books.
DESIP bookstore - population and environment books.
Powell's Books - in print and rare and collectible books.
Hamilton Books - publishers' closeouts and over-stocks.
Many of Garrett Hardin's articles are also available on the The Social Contract website - see Journal archives.