A elementary classroom needs to have 1500 books in it to be considered a well stocked library.
I don't remember exactly where Caroline got this information, but in looking around I don't know of many classrooms that have 1500 books. One way to increase the number of books in a classroom is by writing them yourself. Caroline recommends taking a topic and writing 4 quick stories - a noun story, verb story, adjective story, & preposition story. The books should be supported by photos or illustrations. Books can then be used to support a theme or topic of the month. Here's a link to the original information posted by Caroline Musselwhite:
Stories in a New York Minute