use a grinder to cut open the safe.. good luck if you wanna find the combo.
Books are 99% worthless. keep them or donate. i have bars in my town that buys old books and just carves them up into art.

9/18/2020 USA Grandpa Bill: STOP! No, the books are not worthless. Complete sets are worth more than partial. "Half Price Books" buys used books. And there are others also who do this. Purchase depends on title, year, condition. In the entire collection there you might have one book worth all the effort, or you might have several. 1st editions are best. Looks like a set of Audel's up there. You might assemble the books by general subject then call around locally. You could put this photo out on Craig's List in your area and sell the entire collection for a set price...$25, $50, $100, $200. Depends.

#10 for the safe: check out the LockPickLawyer on Youtube. That guy can crack everything open in seconds.

Some of those books are very valuable - I know because I own many of them and it took me an age to find them! Many folio society editions there; they’re worth a small fortune!