The Rule of Three

Does anyone have this book? I'm trying to track down its ISBN so I can add it to my wishlist on BookMooch and/or order it via Amazon but I'm not having any luck. All I know is it was published in 1962 and consists of three 1-act plays (The Rats, The Patient, and Afternoon at the Seaside).

Worldcat gives 0573020043 and 0573022232 as possibilities.

Close, but not quite. Those ISBNs are for 2 of the 3 plays featured in Rule of Three but published individually. Since they're all exceptionally short (I don't think any are more than 40 pps) I'd still rather hunt for 1 obscure but all-inclusive book. But if I ever concede defeat at least I know I can get them separately, so thx for the above fleela.