pometablava said:
It seems that Editions Lariviere has added Avions Northrop to its Minidocavia series. Several unknown unbuilt designs would have been added. I have send them an email looking for info.
I bought a copy of the book. It's 128 pages paperback, and covers all Northrop aircraft from the beginning of Jack Nothrop's career in 1918 until the present day Northrop-Grumman company. Quite a few unbuilt projects are also included. The amount of text for each type is relatively limited - not surprising, if you consider the large scope and small size of the volume. To give you an impression about how deeply any unbuilt projects are covered, here os a scan (in
extremely low quality, to avoid copyright violation troubles

) of the sections about the N-167 and N-176 projects.
I also scanned the N-1 to -160 project listing, which is interesting to number addicts like me

.
I don't know any other readily available book about Northrop aircraft, which includes so many unbuilt projects, and so I think it's a valuable addition to my bookshelf. For me, the language is a slight problem :-\, because I had my last French lesson 25 years ago, and absolutely zero practice since then. But this book is a good opportunity to refresh long-lost memories

.