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By Topic

• 501
• Marquette, Jacques
• Article from the Catholic Encyclopedia.

• 502
• Douglas Mawson
• Profile of the Antarctic explorer and information about the Australasian Antarctic Expedition.

• 503
• Doug Davies: Navigation Researcher
• Essays about the Peary expeditions controversies.

• 504
• North Pole Expedition Archives
• The National Archives and Records Administration's exhibit of original documents from the expedition.

• 505
• Francisco Pizarro
• Concise biographical article from the Catholic Encyclopedia.

• 506
• Marco Polo
• Biographical article from the Catholic Encyclopedia.

• 507
• Juan Ponce de León
• Concise biographical article from the Catholic Encyclopedia.

• 508
• Sir Walter 'the Unfortunate' Raleigh
• The Incompetech website's satirical take on Raleigh.

• 509
• Sir Walter Raleigh (1552-1618)
• Biography, bibliography, essays, and resources at luminarium.org.

• 510
• I Am But Dust
• Raleigh's letter to his wife before his execution.

• 511
• Poetry Archive: Sir Walter Raleigh
• Selection of poems.

• 512
• The Works of Sir Walter Ralegh
• from The Luminarium.

• 513
• Doomed Expedition To The South Pole, 1912
• Extracts from the journal of Antarctic explorer Captain Robert Scott describe the final days of his failed expedition.

• 514
• Robert F. Scott
• Biography, photographs, bibliography and recommended reading.

• 515
• Antarctic Explorers: Ernest Shackleton
• Biography and detailed overview of Shackleton's expeditions.

• 516
• The James Caird Society
• Charity named after one of Shackleton's vessels. Illustrated expedition summary, with information, news, and publications.

• 517
• The Soviet Manned Lunar Program
• The evolution of the plan to land cosmonauts on the moon, with references.

• 518
• Virtual Space Museum
• An online multimedia museum devoted to the Russian space program. Includes timelines and 3D spacecraft models in VRML.

• 519
• Why the Soviets Never Beat the U.S. to the Moon
• A Soviet space expert discusses how recently declassified material confirms his painstaking discoveries over decades about why the Soviet Union was unable to win the space race.

• 520
• NASA History Office
• Current events; index of sites covering history of major aeronautic and astronautic programs, key NASA and NACA (1915-1958) officials, policy documents, statistics, timeline of air and space achievements; publications; links to other resources.