One thing I most like about both Eric's and my Oz collections is that each have many little sub-collections - detours down forks on the yellow brick road that most Oz collectors have never traveled down.
While I'm not particularly interested in the Gothic Romance novels she wrote in her latter years, I do have a fondness for her Science Fiction novels (published under the psuedonym E. L. Arch), her Mystery novels, and a small handful of her YA "Career" novels, many of which are quite enjoyable.
Another strong side-road in my Oz collection is foreign editions of the Oz books - I probably have about three hundred at this point, dating from the early 1930s on up to brand-new in 2012.
Today I got a new item that fits in both side-collections - a German edition of Rachel Cosgrove's Bridge to Yesterday, an SF novel first published by Avalon in 1963. I had expected a regular paperback book to arrive, but this German edition, titled Verlorene Vergangenheit (The Lost Past), was published in 1964 in a dime-novel series called Utopia - a series devoted to Zukunftsroman (future stories). It's very thin, stapled at the spine, with the text printed in two columns on newsprint - it feels like a slightly undersized old-fashioned comic book.
I like the German cover much better than the American cover. The scene depicted is when Leo Tenney and a man he's been chasing run smack into the Minotaur (a bull, anyway) in the Labyrinth at a sort of futuristic theme park which reminded me of Michael Crichton's Westworld - though Cosgrove's theme park predates Crichton's by a decade.
You can read more about the American edition of Bridge to Yesterday in this previous blog post.
So, dear readers, do you have any odd little detours in YOUR Oz collections?