Recover a Combination to A Master Padlock - A brief but useful webpage revealing a method of finding the combination of  a Master combination padlock.

Master Thumbwheel type locks - Useful information on this type of lock.

Master Key Storage Lock - Designed to store keys and locked with a four dial combination. A brief guide to assist with the opening of these.

Safe Combination Information - An informative guide to Safe Locks.

How stuff works - Combination Lock - Nice pictures of how a combination padlock works.

How stuff works guide to safe cracking - Good, easy to follow information on safes - clear pictures.