Included here are the surveyors of all climes and types of space, for these men ranged the earth, underwater, into the heavens and from pole to pole. Starting with the explorers of the late 19th Century and concluding with John Glenn's space flight, Peary, Byrd, Hillary, Picard et al are served up in the bland fashion of the encyclopedia article -- almost all the facts are here, but the excitement that these men generated is missing. Bibliographies of the subjects' writings have been worked into the concluding sections of each chapter. Someone may be inspired to read on?