Swedish Author and Illustrator Maj Lindman produced a Juvenile series about sibling triplets- boys and another about girl triplets. This book is about the three brothers. Originally published in Sweden in the 1920- they were popular in the US in the 30's.
Maj Lindman (Mrs. Maj Lindman-Hulten) lived in Stockholm, Sweden. She attended the Royal Academy of Arts in Stockholm, and also studied art in Paris, France. She wrote and illustrated numerous children's books, but she is best known for her delightful tales of triplet girls Flicka, Dicka and Ricka and their boy counterparts, Snipp, Snapp and Snurr.
Energetic young boys almost find themselves lost at sea precipitating the need for swimming lessons. As always, the wholesome triplets take it a step further and magically excel at swimming after a few short lessons. Still, a good example of the bad things that can happen all too quickly when out on the water.