The books were regular sized, approximately 8.5 x 11″ and were numbered. Maybe 8 to 12 of them? Illustrations were art deco or art nouveau (I get them confused). Not lots of vivid colors. Heavy black lines/white/gray/yellow/rose colors. Each book had stories and poems. I am not positive that they came with a set of encyclopedias, but that is my general recollection. I could have been World Book or Encyclopaedia Britannica, since we acquired both around the same time. Any ideas?