We’ve seen a 1949 Sun Valley booklet that has almost nothing in common with this one. The difference, which is not indicated by any text on the covers, is that this one focuses on summer activities while the 1949 one focuses on winter sports.
Other than a couple of graphics showing room accommodations, the only things the booklets have in common are the size and number of pages. Both have fold-out back covers, but the maps inside those covers are completely different, as are almost all graphics in the booklets and even the fonts. It is almost as if they were designed in completely different eras, but the winter one was published in September, 1949, while the summer one was issued just five months later in February, 1950.