Three is the limit on tags for free-space pages. I think the three tags currently on the page are the best choices for it.
You can link to the one-place study page from other pages by formatting the link as [[Space:Levelland, Texas One Place Study|Levelland, Texas One Place Study]]. For example, on a person's profile or on a category page you might add: "Also see [[Space:Levelland, Texas One Place Study|Levelland, Texas One Place Study]]."