Even though I have a ton of Andre Norton books I could
not resist these somewhat odd and colourful examples by
Philip Castle's for UK publisher Tandem Science Fiction.
The Beast Master cover Ed Valigursky, The Sioux Spaceman cover Ed Valigursky
I thought this was a good sequel to The Time Traders, it is not a repetition of the earlier book, the is plot are quite different with Fox becoming the main character. There is lots of action, some interesting twists and it is certainly not predictable. With the addition of Travis Fox, Norton also expands the range of the story adding a level of complexity that will resonate through the next two volumes in the series.
It is interesting that in both books in this series, time travel is simply a mechanism allowing the team to encounter aliens and space travel. In Galactic Derelict after locating the alien ship Fox, Murdoch, Ashe and the technician Renfry are accidentally launched into space, while the ship, following some preset course takes them on a tour of several alien planets. This theme of stowaways on spacecraft, intentional or otherwise is a common one in SF and Norton handles it well.