CD-ROM and Book. Man's on-going conquest of the solar system has been much publicised for its miraculous accomplishments. What is generally less publicised are the potential uses of space beyond simply landing men on another planet. 'Flags and foot-prints' is something we can all be proud of, but the true value of near-Earth space lies with the possibilities for manufacturing and colonisation. Processes not possible on Earth, because of atmosphere and gravity, can be employed in space to produce unique and highly desirable commodities. Habitats built in space, occupying the same orbit as the moon and made primarily from lunar raw materials, can be the necessary answer to our desperate, ever-increasing needs for living and agricultural areas. O'Neill is universally recognised as the father of the 'O'Neill colony' concept. Beginning in the 1970s, he took the original concepts and built from them a complete, realistic and attainable plan -- a plan to orbit permanent colonies at the L4 and L5 Lagrange points in near-Earth space, where everyday people would live, work and play in comfort and safety in an environmentally satisfying world. In this 3rd edition of The High Frontier, is O'Neill's original blueprint for the future, accompanied by new chapters presenting the up-to-date technologies and social considerations that impact upon and further justify the plan. This is a vision of a possible hopeful future that could already have come to pass if the human race had committed to it -- it is still a source of hope for the future.