In 1960, what Latin version became the first foreign-language book to appear on the New York Times bestseller list?

Winnie-the-Pooh (1926) is the first volume of stories about Winnie-the-Pooh, by A. A. Milne. It is followed by The House at Pooh Corner. The book focuses on the adventures of a teddy bear called Winnie-the-Pooh and his friends Piglet, a small toy pig; Eeyore, a toy donkey; Owl, a live owl; and Rabbit, a live rabbit. The characters of Kanga, a toy kangaroo, and her son Roo are introduced later in the book, in the chapter entitled "In Which Kanga and Baby Roo Come to the Forest and Piglet has a Bath". The bouncy toy-tiger character of Tigger is not introduced until the sequel, The House at Pooh Corner.

The work has been translated into many languages, including Latin. The Latin translation by the Hungarian Lénárd Sándor (Alexander Lenard), Winnie ille Pu was first published in 1958, and, in 1960, became the first foreign-language book to be featured on the New York Times Best Seller List, and the only book in Latin ever to have been featured therein.