Related by context. Frequent words. (Click for all words.) 65 Antarctic expedition 53 Ernest Shackleton 52 polar explorer 52 expedition 51 Sir Ernest Shackleton 51 Arctic explorer 51 Antarctic 49 polar expedition 46 Expedition 46 Antarctica 46 Everest expedition 45 expeditions 45 Royal Geographical Society 44 Antarctic Territory 44 Geographic Society 44 NEEMO 44 Roald Amundsen 44 IODP 43 polar explorers 42 Antartica 42 HMS Beagle 42 Weddell Sea 42 Geographical Society 42 McMurdo Sound 41 Sir Ranulph Fiennes 41 Clark Expedition 41 IPY 41 adventurer 41 ICESat 40 Dam Busters 40 Adventurer 40 glaciologist 40 aviator Amelia Earhart 40 Sea Shepherd vessel 40 ESA astronaut 40 Ross Ice Shelf 39 explorers 39 hydrographic survey 39 Apollo missions 39 Piers Sellers 39 circumnavigation 38 Berlin Airlift 38 Amundsen 38 Mars# 38 aviatrix 38 voyaging 38 voyaged 37 voyage 37 Robert Peary 37 whaling vessel 37 HMAS 37 Voyage 37 paleoclimate 37 Everest Expedition 37 Mars Pathfinder 37 re enactment 36 Burt Munro 36 glaciology 36 Sir Edmund 36 Ed Viesturs 36 McMurdo Station 36 planetary exploration 36 Meriwether Lewis 36 reenactor 36 solo circumnavigation 36 Sir Edmund Hillary 36 Krikalev 36 Space Agency 36 aviator 36 Villers Bretonneux 36 Encampment 35 Rothera 35 mountaineer 35 polar 35 explorer 35 Hadow 35 Normandy landings 35 HMS Belfast 35 AUVs 35 conquered Everest 35 geomorphology 35 Red Planet 35 oceanographic 35 British Antarctic Survey 35 HMAS Sydney 35 Martian surface 35 Sir Ranulph 35 Rowing Race 34 Coast Guard icebreaker 34 Polar Regions 34 Antarctic ice 34 Antarctic seas 34 Primal Quest 34 Burgess Shale 34 Fort Clatsop 34 voyages 34 Boer War 34 Astrobiology 34 yachtswoman 34 Re enactment 34 Discoverer