I read a sentence in Word by Word by Kory Stamper which was:
Steve and Madeline both have an abundance of plants in their cubicles; one of our cross-reference editors has set up pictures of her cats (and other people's cats) along the long banked bookshelf each of us has to keep multiple dictionaries open at once.
The part I have a question about is the highlighted one. Since it is a relative clause and its antecedent is "bookshelf" (I suppose), I think there should have been "upon" or some preposition like that after "upon" to relate it to the antecedent "bookshelf". Am I right?