Z80 Books

Here is a list of Z-80 books in no particular order

Assembly Language
Programming in Z80 Assembly Language

Z80 Assembly-Language: Programming for Radio Shack, Timex Sinclair, Adam, and Cp/M Computers ([A Computer literacy skills book])

Introducng Z-80 Assembly Language Programming

Z80 Assembly Language Programming Manual

8080/Z80 Assembly Language: Techniques for Improved Programming

Z-80 Assembly Language Programming

I like this one:
Z-80 and 8080 assembly language programming

The Z80 Microprocessor: Architecture, Interfacing, Programming and Design

Programming the Z80

Dr. Dobb's Z80 Toolbook

Math Toolkit for Real-Time Programming

8080/Z80 Assembly Language: Techniques for Improved Programming


Hardware and Interfacing

101 Projects for the Z80

The 8080, 8085, and Z80: Hardware, Software, Programming, Interfacing, and Troubleshooting

8080/Z80 Assembly Language: Techniques for Improved Programming

Z-80 Microprocessor: Architecture, Interfacing, Programming, and Design (3rd Edition)

Z80 Applications

Z80 Users Manual

Microprocessors and Microcomputer Based System Design: Second Edition

Build Your Own Z80 Computer

Microcomputers and microprocessors/ the 8080, 8085, and Z-80 Programming, Interfacing and Troubleshooting