11.   As for locating smaller tour companies, Web sites and toll-free telephone numbers for tourism bureaus in the United States and abroad are valuable resources.

12.   At least six tour companies offer book tours, and most leave from the Visitors Center.

13.   Bigger tour companies often include tickets from Miami to Ecuador in the package.

14.   Both have long lists of tour companies.

15.   A number of tour companies specialize in taking travelers to the best viewing sites.

16.   A phone message left for the tour company, Discovery Tours, was not returned.

17.   A small number of American tour companies specialize in guiding them and gaining permission to visit remote areas.

18.   A. Several United States tour companies are arranging for the viewing of the total solar eclipse you refer to.

19.   A. The tour company Venice Simplon Orient-Express still offers a wide variety of day trips from London and other cities aboard its restored British Pullman train.

20.   A. There is one tour company you should know about, as well as one special event this month.