Thanks for the info. Tried looking up 951 Boulder Highway and . . . Charlie keeps taking over. Y'see, Arizona Charlie's Boulder has phone number 702-951-9000. Apparently you can stay there for $34 a night.

"Hey, Charlie, look over there. Is that an arriving guest?"

Now that he's distracted - I swipe the 1941 Telephone Directory off the hotel desk and, voila:

https://over50vegas.com/1941_Las_Vegas_Telephone_Classifieds.html

And it looks like, yes! "951" is the telephone number of The Dunes, not its address. Wonder if that was also the problem with that Silver Slipper place? We're mixing up house numbers with phone numbers?!!!!

At the very end of the phonebook listing - other available scans of early L. V. phonebooks. If you're so inclined, enjoy!