Anyway, if you find a copy of the Sieworwick, Bell,
and Newell's book
'Computer Structures, Reading and Examples', there is a companion volume
that has many of the ISPS descriptions of the machines discussed in the main
text.
It looks like
archive.org has a copy as part of the Boston Computer
Museum collection:
https://archive.org/details/computerstructures00bell
including what looks to be the companion volume you described:
https://archive.org/details/designanalysisof0000barb