How much can I pick on TR?

I've been slowly reading the book given to me by my TR rep called Marketing on the Internet for Industrial Companies (see post below, too). Overall, I've found it to be an honest, readable book with solid advise and very little bias towards Thomas Register.

That said, I found an interesting table in the book that I'm sure my readers are interested in. The table (click here to see it) refers to a 'survey of Internet users' showing popularity of search engines used on a regular basis:
1. Google 67%
2. Yahoo 52%
3. ThomasRegister 43%
5. GlobalSpec 4%
9. Industrial Quick Search 1.7%

I was instantly suspicious of this information just because of the very industrial bent, while the caption doesn't distinguish that the 'Internet users' are engineers, which they must be. And then other questions abound...searching for what?...how were the surveyed users found?...what industries are they from?...etc. The second chart at least identifies the search to be for 'industrial product information'. Perhaps TR is keeping the valuable demographics that go along with this chart to themselves.

Okay, I was also very suspicious of 43% saying they regularly use TR website and found their results to be the most useful.