The Prentice-Hall Model letter desk book : ready-to-use letters for every occasion. (OCLC #11252172)
This volume has a note in its front matter indicating its relationship to another work, which has been recorded in a note:
500 __ ǂa "Reprinted from Secretary's standard reference manual and guide."--Page 2.
and as an access point:
700 1_ ǂa De Vries, Mary Ann. ǂt Secretary's standard reference manual and guide.
This volume is 64 pages long, where “Secretary’s standard…” is 307 pages long, so this is likely an excerpt of only the parts about letter-writing. So which relationship designator to use?