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the pt size of the fonts are different, the one for external links is smaller, so they don't match.

That was true when David previously used the monospace font for external links. But it's no longer true, and when I inspected the page with Edge, the body text, the local links, and the external links were all 16px.

It doesn't look very nice, looks cheap.

It doesn't look very nice when you have so many external links crowded together. That's why I suggested putting them in a list.

Have you looked to use a sans-serif font in order to contrast with the serif font of normal text?

I just tried it with Web Developer in Firefox. While both sans-serif and mono worked better than serif, I didn't see a lot of improvement in using sans-serif instead of mono. When I look at the column of external links in the footer, which have been formatted into a list, they looked better in mono.

There were a few other reasons why your external links looked bad, which I have corrected. You missed a comma after one link, you omitted the word and before the last link in your sentence, you left out the period at the end, and you placed your spaces inside the links instead of outside. With these problems corrected, it is now easier to tell each link from the other. Even so, I still think using a list would be an improvement, especially if you also put the parenthetical information after each link instead of inside of it.