Halley's Comet in history
Observations of Halley's Comet from Chinese observatories in 240 BC until the present are described.
Yoemans, D. K.↗
Engineering topics
Freitag, R.
Publications and source records attributed to Freitag, R..
After Apollo - The space station, shuttle and tug
Space station with shuttle and tug service, discussing reduced costs, reusability and commonality
Freitag, R.↗