JF Ptak Science Books Post 1980 
With the endless images of the Land of Oz in our minds from the book and movie it is easy for the other lands generated by their creator L. Frank Baum to escape our attention Oz isn’t the only place that Dorothy traveled to–far from it. She went very far and wide in the mind of Baum, who was extraordinarily prolific both inside and outside of the Oz series.
From 1900-1919, Baum (1856-1919) wrote 17 Oz books, as well as another 18 books in the non-Oz realm, plus 17 books in a juvenile series for girls under the pseudonym of Edith Van Dyne, plus six more books under the name of Floyd Akers, plus another seven other books under five other names, plus a pretty wide assortment (200+) of short stories, plus plays. Plus all of the stuff he wrote before 1900. That’s a LOT of writing in 19 years.