A: San Francisco, California, United States
"The actual programming for the initial products happened over a relatively short period, between October and December 1991; the first three book titles (The Complete Hitch Hiker's Guide to the Galaxy, The Complete Annotated Alice, and Jurassic Park) were released at MacWorld San Francisco in January 1992. These books and their successors relied upon a "book engine" that provided a simple but powerful feature set: various convenient and simple search methods, the ability to switch between large print and normal print versions, various unobtrusive navigation tools (such as a chapter menu that dropped down from the chapter heading on each "page"), a margin area on each page in which readers could write notes, and, interactive annotations. For example, Moby Dick included a sound clip of the sea as an annotation, and The Annotated Alice provided pop-up annotations derived from both editions of Martin Gardner's work. However, some readers found these annotations unwieldy and difficult to navigate, with poor usability.
"'Expanded Books' was not initially the definitive title of the product range. One other favored contender was "Power Books", but that idea died when Voyager was told Apple's about-to-be-released notebooks were to be called PowerBooks. Hence, the original project name became the product name.
"Between February 1992 and August 1992, Voyager created The Expanded Books Toolkit, which allowed authors to create their own Expanded Books. Voyager themselves went on to produce over 60 books as Expanded Books; the underlying software was also used in CD-ROMs such as A Hard Day's Night, Salt of the Earth, and Macbeth.
"All programming for the Expanded Books and Toolkit was in HyperCard, with the exception of a few XCMDs and strings stored as resources." (Wikipedia article on Expanded Books, accessed 6-2019).
Thanks to Bob Stein for the 5 images and the reference to the video reproduced here.
"This is the video the founder Eleanor Stokes created for a Douglas Adams animation contest, sponsored by The Literary Platform in 2012. The audio was recorded by Adams for Voyager Books in 1993. Voyager Books was the first company to produce ebooks, and Adams was their first author."