This book is great, but getting a bit dated. It covers x86 32-bit Linux assembly. Very well written.
At this point I recommend Risc-V as a starting point for assembly. The core ISA is uncomplicated, and real hardware is getting cheaper to come by.
This book is OK but its targeted at complete beginners:
FYI, Jonathan Bartlett (the author of Programming from the ground up) has released an updated book called Learn to Program with Assembly. I can't say anything about its quality though.
If you've heard of OReily they have their own digital library that may or may not be clean copies of books that would normally be hacked to death.
Their website is www.safaribooksonline.com it costs 40$/month but you do not need a credit card for the 15 day trial. No verification email needed, just make up a email and you can access a thousand+ books without a credit card.
There are tons of ASM books there, including the 300$ book on x86_64 assembly
Everyone here has given some good answers for how to get into assembly. I would definitely recommend getting a book that teaches assembly to those who are unfamiliar with it. This is the book I got: https://www.amazon.com/Beginning-x64-Assembly-Programming-Professional/dp/1484250753/ref=sr_1_2?dchild=1&keywords=x64+assembly+programming&qid=1620140652&sr=8-2
The only problem with it is that although it explains the concepts very well, it does not make a good reference.
Once you get some experience, one thing that helped me a lot was to have GCC produce assembly from C code. I could then write C code that could help me learn certain assembly concepts. A couple examples would be how parameter passing works when you have more parameters than available argument registers, or how to interact with the stack.
The Secret Life of Programs: Understand Computers -- Craft Better Code
https://www.amazon.com/gp/aw/d/1593279701
Code: The Hidden Language of Computer Hardware and Software
https://www.amazon.com/Code-Language-Computer-Hardware-Software/dp/0735611319
These are good brass tacks books for understanding everything from the bottom up.
This is a good book. Focus is 32-bit x86. Includes C and Assembly. https://www.amazon.com/Hacking-Art-Exploitation-Jon-Erickson/dp/1593271441 I know your target may be MIPS; however, the principals are good as a foundation.