I think this is a 1940s or 1950s this is a reprint of a series from the 1920s. It's a mixtures of sex education and ultra-right-wing, sexist, and racist politics. Dr. Keller is one of the inventors of modern Science Fiction, and one of the writers of Amazing Stories, the Hugh Gernsback magazine. He was an inventive writer, for his day, with a fantastic imagination. However, he was also a racist bigot, and an extremely sexist, and homophobic person.
This collection is incomplete, as not all the volumes are included. It's a reprint by the Charles Atlas company.
I'm selling this for historic purposes. I tried to read it, but couldn't finish.
Contact me with any questions.