Something that's handy for any website is this Google trick.
In the address bar of your browser, type your search term in front of the address, followed by site: in front of the url. Leave a space between the term and site:.
Say you want to find posts about meers. Just make the address bar look like this, and you'll have quite a few hits:
meerschaum site:http://pipesmagazine.com/forums/