You can't bring that whole beast back because he weighs thirty tons or more.
5 seconds sound clip from the X Minus 1 - A Gun for Dinosaur by L. Sprague de Camp classic radio drama series.
You can hear this line at 00:14:12 in the radio play.
Quote context
[...]
- And they're the big ones. They look something like the Brontosaur.
- Why not?
- Well, there's no point to it, and it's not sporting.
- You can't bring that whole beast back because he weighs thirty tons or more.
- That museum in New York got one.
- Oh, yes.
- But they sent a party of forty-eight to the Early Cretaceous with a fifty-caliber machine gun.
- They spent two solid months hacking and sawing the carcass apart and hauling it to the time machine.
- I know the chap on the project, and he still has nightmares in which he smells decomposed dinosaur.
- And they also had to kill a dozen big theropods who came in for the party.
[...]