Lark is right, in the mentioned book by Wolfgang Wagner, the EF 59 IS mentioned,
as the Ju 88 forerunner, but on page 537, a windtunnel model is shown, which, as the
caption says, can be reagarded as the project, that evolved later into the Ju 88.
Unfortunately, this project is designated as EF 73, so not even in chronological order
with EF 59 ... ???
And, to make matters worse, on the pages 534 and 535 a number of windtunnel models
with different configurations for a jet bomber are carrying the designations EF 55 to
EF 59, the last quite obvious just one step from the final Ju 287 configuration.
Maybe, designations were used twice (then there were around 8 years between the "first"
and the "second" EF 059), or maybe differences were made between windtunnel testing of
configurations and actual projects. And the heading on page 534 speaks of the "Neue EF-
Entwicklungsreihe" (new line of designs) ... ???