1933/11 – Contents as taken from the front cover and contents page inside are as follows:
From Wikipedia: “”The Red Pony” is an episodic novella written by American writer John Steinbeck in 1933. The first three chapters were published in magazines from 1933–1936, and the full book was published in 1937 by Viking Penguin. The stories in the book are tales of a boy named Jody Tiflin. The book has four different stories about Jody and his life on his father’s California ranch.”
The 18 pages are one of those first three chapters, judging by the date I’d assume the first of them.