Through all the years of collecting children's mystery series books, I have seen very little promotional material about them and that is one reason I find the tri-fold "Who's Who" ad that was included in some Grosset & Dunlap books in 1964 very appealing (see prior article on the famous ad). Here are a few more items that I found on eBay that came from magazines or catalogs. Obviously, these ads go back some years, so those who enjoy antiquing for books, might take another look at those stacks of Sears or Penney's catalogs in the local antique mall that date in the 1940s-1970s. You might find some ads similar to these. (note, Google blogs allow any photos placed in this section of the blog to be enlarged when you click on them, so be sure to enjoy the up close view by doing so.)

This is from a Wards catalog.
This one is dated September 1942 from a magazine called Playthings.


This is also a Wards listing and note the Mildred Wirt books on the right side, advertising Brownie Scout and Dan Carter Cub Scout books.