First American edition, McGraw-Hill, 1969
First British paperback edition, with Vivian Darkbloom's notes,
cover design (Cattleya orchid) suggested by the author, Penguin, 1970
Ada in Time and Space
These are English translations of two chapters in the appendix of the annotated German re-edition of Ada, translated by Uwe Friesel and Dieter E. Zimmer, published by Rowohlt Verlag in September, 2010.
and Antiterra Gazetteer