This is the 121st most frequent Slovenian word.
katerih
"Of which" or "whose" (genitive plural form).
'Katerih' is used as a relative pronoun referring to 'zaloge' and denotes possession or relation (i.e., 'whose').
To so zaloge, katerih kakovost preverjamo vsako leto.
These are the supplies whose quality we check every year.
'Katerih' is instrumental here in linking 'ljudi' with 'domovi', signifying possession or association.
Poznam ljudi, katerih domovi so zelo raznoliki.
I know people whose homes are very diverse.
In this sentence, 'katerih' introduces the possession of 'avtorji' to 'knjige', emphasizing authorship or ownership.