The First Century of Flight: NACA/NASA Contributions to Aeronautics is on-line at http://history.nasa.gov/centtimeline/index.html. This is an informative and attractive Web exhibit set up in a timeline format. Special thanks to Tony Springer, who supplied the content; Ray Brown, who created the hard copy version; and Douglas Ortiz, who created the Web version.

Spacelab: An International Short-Stay Orbiting Laboratory (NASA EP-165) by Walter Froehlich is on-line at http://history.nasa.gov/EP-165/ep165.htm. The full text and rich images from this informative book about Europe's first major undertaking in human spaceflight are now available on-line thanks to volunteer Chris Gamble's expert help.

NASA Sounding Rockets, 1958-1968: A Historical Summary (NASA SP-4401, 1971) by William R. Corliss is on-line at http://history.nasa.gov/SP-4401/sp4401.htm. The full text and images from this book about our initial forays into the upper atmosphere at the dawn of the space age are now available on-line thanks to volunteer Chris Gamble's expert help.

In addition, Chris Gamble has updated On Mars: Exploration of the Red Planet, 1958-1978 (SP-4212, 1984) by Linda and Edward Ezell to include all the images and a useful page index. It is on-line at http://history.nasa.gov/SP-4212/on-mars.html. Chris Gamble has also worked with Keith Laney to update Apollo Over the Moon: A View from Orbit (SP-362, 1978) to include special high-resolution scans. This book is on-line at http://history.nasa.gov/SP-362/cover.htm.