John R. Neill illustrated a number of books for the Henry Altemus publishing company, of Philadelphia. Many of these were standard series titles, for boys and for girls, and are mostly forgotten today. Neill isn't credited for his work in most cases, but his drawings are unmistakable.
He also illustrated several smaller story and fairy tale books for the company. These were done around the time of Marvelous Land of Oz, and the illustrations are in a simpler style - but highlighted with red and blue.