The six book Jonas Series was published by nine different publishers. Thomas Y. Crowell and Company, a New York firm, was the last to print these books. Between 1883 and 1893 the books were published as individual volumes. Between 1893 and 1901 they were published in three combination books (two titles to a volume).
I am adding a new cover color to the website today. For more information see http://www.jacobabbott.com/JS/index.html
Interestingly Crowell used the same cover for the Juno Series, Rollo Series, and the Cousin Lucy Series.