41.   Rangers at the national park can offer suggestions for day hikes and often lead evening tours that include dramatic views of the lava flow.

42.   Rangers lead free tours from May through September, according to Russ Bodnar, the park spokesman.

43.   Roadtrips was the brainchild of a man named David Guenther, who led spring break tours while still in college.

44.   She began leading tours to St. Petersburg, Russia, soliciting contributions and turning over any profits from the tours to the foundation.

45.   She lived in a commune, lived with friends, and even shared living space with a nephew in Boston while she traveled the East Coast leading travel tours.

46.   Student guides lead free tours in French, English and German.

47.   The latter tour will be led by John Wise, curator of malacology at the Houston Museum of Natural Science.

48.   The helicopter did touch down briefly at another settlement where Foreign Minister Ariel Sharon, who was leading the tour, left the group to board another helicopter.

49.   The people leading the tours include historians, entrepreneurs, nonprofit institutions, licensed guides, unlicensed guides and rank amateurs who are pretty much talking through their hats.

50.   The tour will be led by James Petersen, a senior editor and writer of the series, who was in town recently for a practice run.