Does anyone know the font that is used on the Mt. Whitney summit sign?

Would similar ones suffice? At that time, fonts were metal type made for printing on a surface like paper. That sign wasn’t printed though and didn’t use what we consider a font today. 

As Ralf said.

You could find some pointers starting from the presentation of WPA Gothic.

download at MyFonts

download at MyFonts

 

I can definitely make use of the suggested fonts.  Thank you for responding so promptly and for the background information on how that sign was made!