There are 4 disk images:
AssemblyLinesWagnerDOS1.DSK
AssemblyLinesWagnerDOS2.DSK
AssemblyLinesWagnerProDOS1.DSK
AssemblyLinesWagnerProDOS2.DSK

They contain all of the assembly language programs from Assembly Lines: The Complete Book, by Roger Wagner.

They should probably go in pub/apple_II/images/programming/assembler

Thanks!
-Chris