This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
A very simple way to pull a staple is to use the claws of an ordinary carpenter's hammer and a nail, as shown in the sketch. The staple can be removed quickly without being bent, and no damage to the material into which it was driven will result.
With nothing but ordinary tools the removing of staples is tedious and difficult work. If a suitable -sized wire nail is bent like a fishhook and the hook part driven under the staple, the latter can be easily pulled out by grasping and pulling the nail with a hammer in the usual way. - Contributed by R. Neland, Minneapolis, Minn.