This 180 page book covers the new Blazor UI framework, including how to create server-side and client-side WebAssembly projects, how to implement authentication and authorization, and how to use data binding. It then covers how CSLA .NET supports Blazor, including walking through a complete sample app.
Chapters:
Update: As of 19 May 2020 Blazor WebAssembly is released, and the book online at this time is the final book, including updates for the RTW of Blazor WebAssembly.