09 July 2012

Explorers

Siberian explorers

Explorers of Russian America

Circumnavigators

Travelers in the tropics

Explorers of Central Asia

Polar explorers

Cosmonauts

Inventors and engineers

Polymath inventors

Weaponry makers

Land transport developers

Naval engineers

Aerospace engineers

Structural engineers

Electrical engineers

IT developers

Optics and photography pioneers

Communication engineers

Musical instrument makers

Miscellaneous inventors

Scientists and scholars

Polymaths

r plans
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