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I think what you are looking for is the following but please don’t just take my word for it:)
User-agent: googlebot
Disallow: filename.htm
added: There are probably other, perhaps better, ways to do it but this is the way I know about.
If any of these are reciprocal links, of course, your linkees may not be happy if they are astute enough to check your page and/or robots.txt file. It's kind of an unwritten assumption that if you are exchanging links you are exchanging spiderable, indexable links.
I'm no expert on it, but I doubt that google would consider one page a "link farm". Links pages are a net tradition, and since google thrives on links it looks to me like they go out of their way to find them. They spider my links pages a couple of times a day, I just wish they found my content pages as interesting.
I know of several non-spam pages with hundreds of links on them that have high PR. I would recommend that you just be careful about what sites you are linking to. Are any of them in a bad neighborhood?