The place to seek out ACH specs?

Hello all,

I've been tasked with discovery work associated to ACH and wish to ensure our group can be compliant with the foundations and laws.

I discovered this retailer on the NACHA web site: https://www.nacha.org/merchandise/2022-nacha-operating-rules-guidelines

Does this e-book embody sufficient technical element appropriate for a developer to work? Are there some other sources I must be taking a look at? Thanks upfront.