| Solar Eclipse - Offers tours to see solar eclipses and other astronomical occurrences, led by a NASA astronomer with occasional appearances with NASA astronauts.
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| Geotours - Offers guided tours to geologists and others interested in collecting rock, minerals specimens and fossils in Argentina, Uruguay and Paraguay. Services, sample tours, costs.
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| Sahara Overland - Morocco fossils and minerals as well as paleontological, geological, and off road field expeditions.
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| Hole in the Sky Tours - Specializes in quality solar eclipse expeditions, combining vacations with optimized eclipse viewing. Eclipse information and resources. Contact information for California operation.
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| Diamantina Outback Tours - Offers expeditions based on natural history to remote regions of Outback Australia. Details of tours, booking, information on the Outback.
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| Butterflies of Kerala - A guide to the butterflies of Kerala, with a collection of photographs, from a travel agency site.
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| Watershed Belize Field Course - Describes watershed field course designed to experience travel through a tropical watershed in Belize; a journey from the Maya Mountains rainforest to the Barrier Reef.
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| Global Expeditions - Expeditions to foster exploration, conservation, community and medical aid in remote areas, led by John Blashford-Snell of Scientific Exploration Society.
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| Phylum Tours - Phylum Tours leads individuals and groups to the remote and beautiful regions of Madagascar with customized tour packages focusing on natural history. Tours, testimonials.
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| Burren Hill Walks - Guided walks through the Burren region of ireland on geology , botany and history. Choose from a large variety of walks.
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| Natural Selection Expeditions - Offers a selection of tours to the Galápagos Islands for both independent travellers and charter groups. Company profile, tour descriptions, news, travelling tips.
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| Volcano Live - Provides information about volcanoes, eruption, and volcano treks, and links to other volcano educational sites. Includes links to volcano-cams.
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| Kayenta Scientific Investigations - Information about geoscience tours in the Western United States.
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| Parawild Safaris - Works with professional game capture specialists in South Africa. Visitors can have an hands-on, educational experience while being a part of wildlife conservation in action. Also offers traditional wildlife viewing, cultural safaris, and adventure tourism.
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| The Orchids of Cyprus - Information about planning a self-guided trip to Cyprus to see the native orchids, and recommends a new book on the subject.
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| Scientific Expeditions to Patagonia Organized by University of Connecticut - Groundbreaking ecological research at Torres del Paine National Park, Magallanes, Chile. Details about past and future expeditions.
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| Raymond Wiggers, Guide and Educator - Professor conducts geology and botany tours. Site has links to free geology and botany information, details about past and upcoming expeditions, and photo galleries.
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| Reef and Rainforest Tours - ATOL-bonded tour operator features natural history itineraries, tailor-made and small group trips also available.
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