Inventors and discoverers :

Washington, D.C. : National Geographic Society, 1988 . 320 p. : , Includes index. 28 cm.. 0870447513 (alk. paper) : | 0870447521 (deluxe : alk. paper) : | 087044753X (lib. bdg. : alk. paper) :

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We Americans /

Washington : National Geographic Society, 1975 . 456 p. : , Includes bibliographical references and index. 32 cm.. 0870441345

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Inventors and discoverers :

We Americans /