Here's a few:
http://www.homebrewtalk.com/f12/anchor-porter-clone-4429/
http://forum.northernbrewer.com/viewtopic.php?f=4&t=84670
http://forum.northernbrewer.com/viewtopic.php?f=1&t=91267
http://chris.norrick.com/norrickenbier/20.html
Extract: http://www.beertools.com/html/recipe.php?view=3243
Extract: http://www.donosborn.com/homebrew/Beer_Log2003.htm
Here's my google search:
https://www.google.com/search?q=%22anchor+porter+clone%22+clone+OR+recipe