MANUAL means you will link to the first page of an area so you may view page by page.
             AUTO   offers a keyword search engine which will return you a list of links to pages with those keywords.

Sample search expressions:
The following examples illustrate the kind of expressions that you can use to search the index(es)

• truck     ...................................  a single word
  

• truck and construction .............  2 words not necessarily in a row
  
• tool and hammer or driver .......  2 words and a related word.
  
• trade and (d-mart or barre)......  a word and its related catagory.
  
• students and j*        ..................the star means "ALL names starting in the letter J

For best results enter just one or two words. 
Searches on more than one word will be treated "as a phrase". 
Use the asterisk (*) character for wildcard searches.