Book Finds: Nancy Drew, Hardy Boys, Dana Girls, Trixie Belden, and Oz

I found these books on September 9.  Click on the images in order to view at a higher resolution.

Bungalow Mystery, Tapping Heels, and Old Attic are first picture cover printings.

Secret of the Caves is the first picture cover printing.

I found these books on September 16.

Broken Locket has double oval endpapers.

I also found Captain Salt in Oz in an early edition. 

I know very little about Oz and the values of the books, but I am confident that this book is worth more than I paid for it.  The book is copyright 1936 and looks to be from 1941 based on the last title listed on the dust jacket.  I feel like it was a pretty good find.