Guns above 16in planned in the 1919 to 1921 period

I continue to be interested in the guns above 16in caliber that were planned in the 1919 to 1921 period. The Washington Naval Treaty killed them off, but they existed at least as specifications, if not prototypes. Brassey's Naval Annual for 1919 to 1921 lists the characteristics, such as weight of the piece, length, shot weight, and muzzle velocity. Such information is of interest to those, like me, who are designing ships using Springsharp.