businesses along "famous" streets - sometimes adding historical photos. Such studies have been done for El Dorado Street in Stockton, CA, various sections of Historic Route 66, and Old Route 40 in North Sacramento. But since First Street in Las Vegas doesn't really fit into that pattern, there may be no such resource. You might try a historic society in Las Vegas to see if they have anything further.

Or - "Fez the facts" and go on to another project.