The back button on the browser. And the Combine feature would allow you to go back and combine older searches. The back button on the browser. There is no way to combine older searches. Users can rerun them but not combine them.
All search fields have browsable indexes.
Typical ProQuest user-friendly screen. Is a very nice error message as error messages go. The button on the screen takes you back to the main search page, but it does keep the search history. The back button doesn't penalize the user though. 3.6 Appropriate graphics, icons, etc.