1939 Horlicks Poster Stamps, Tom Sawyer on Raft,

1939 Horlicks Poster Stamps, Tom Sawyer on Raft, Knight, on this set of 4 designed to be put into a Horlicks stamp book. I thought I knew a lot about fairy tales and Childrens stories until I tried to identify all of these stamps. I would appreciate anyones help in identifying these stories as we have passed them around and can't seem to find the answers. The stamps are unused, I have shown the front and back for you to view condition. The front is mint condition and the back may have a little paper off or extra printing on it or not , just see photo as we used this template for all of them and some have nothing on the back. I still consider them mint condition as glue is still on and they have not been used. This is a set of 4 including #13, 14, 19, 20, One showing a couple dancing, Tom Sawyer on a raft, A knight on a horse and a withc with a boy that looks like Peter Pan in a cage. These are connected (not torn apart), each stamp is 1 1/2 x 1 3/4"" and the sheet measures 3 3/4 x 3"" and are marked Storyland Stamp 1939 Horlick's