How is this phrase to be interpreted?

You can omit the preposition in this phrase.

This metal is comparable to iron in strength.

I wonder if you could tell me if there is a post office in this area.

Is there a nearby branch of a Japanese bank?

Note that the impetus for change has undergone a series of transformations in this community.

This fish is unfit to eat.

It is very imprudent to swim in the rapids.

This blotting paper absorbs ink well.

This monument was erected in February, 1985.