This book contains a section about fashion history and context for the 1930's, then delves into a handful of projects and walks you through making them (and caring for them later). They also give you patterns taken from the garments you're reproducing. It uses the relatively standard method for pattern transfer and scaling, with the gridlines. So if you have experience with this method it should be very easy for you.
From what I can tell from the images included for each project, the garments in the book are very likely extant garments. So these are authentic patterns... That being said, I've removed a star from my rating due to the fact that they neither verify that they're extants, nor give the museum or collector's information- making it near impossible to look them up elsewhere if you want more photographs, better views, or more information.
Not providing the proper information for extants is inexcusable in my opinion, and a major negative mark against any authors and books which do so... Though it is made marginally better by the fact that they do include a bibliography at the end of the book. That bibliography is largely (if not entirely) sources for the historical section, however, and there's a few in the list that I've read but wasn't impressed with.
Still. If you have a bit of sewing experience and want to dip your toes into authentic vintage and antique reproduction, this book might just be gold; even though I hate actually using patterns, I'm very tempted to copy them down and spend a few months making every project in the book just to get myself used to the techniques and methods of the era.