We had a large-format hardcover book growing up (in the US in English) that contained illustrations and fictional snippets about alien spacecraft. It would have been published in the late 70s or early 80s. The text with each picture contained information regarding the ship like engine manufacturer and other various specs. I remember the pictures being very well drawn. Does this sound familiar to anyone?
And of course I found it right after I posted. The book is "Spacecraft 2000 to 2100 AD" and appears to be related to an RPG. Some of the art is shown here.
If anyone enjoys well done spacecraft art, I highly recommend. It still looks great and brings me back. If anyone is familiar with the old Battletech technical guide books, this book used the same format with a picture, technical specs, and a short blurb.