We avoid this issue by naming books after their functional scope:
The thinking being (a) we avoid this whole thread, (b) we don't have to superfluous terms like "manual" or "guide" that state the obvious, and (c) end users typically have a functional domain and, as such, only want/need content that addresses their work. Installation is typically one-time, perhaps not even done by the customer; Operation is day-to-day routines; Administration is typically one-time plus regular maintenance and infrequent adjustments (e.g., new regulations) or additions (e.g., new users due to new employees). Also, a given site might require several Operation manuals but only one Admin manual.
I realize this is more than you asked for, but there's more to consider than just (bad) use of possessive.
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