Yes much has transpired since both of those books were written. Yet each book is depository of information/reference.

Not many people venture in to the woods during deer season with a lever action rifle chambered in 303 Savage or pump-action chambered in 35 Remington. Some times it’s good to look back and remember that a Remington model 41 pump action rifle is splendid eastern woods hunting rifle.

If one includes Elmer Keith’s Sixguns in their personal library than Pistols a Modern Encyclopedia is a good companion reference.