Wikipedia page about this book: https://en.wikipedia.org/wiki/Heidi

Project Gutenberg has several editions of this eBook:
#20781 (Fine paintings in color)
#1448 (Text file only)
#46409 (Illustrations in B & W and color)

Release date is 1998-09-01

"Heidi" by Johanna Spyri is a work of children's fiction published between 1880 and 1881. When five-year-old Heidi is sent to live with her reclusive grandfather high in the Swiss Alps, she discovers the beauty of mountain life and touches the hearts of those around her. Later taken to Frankfurt as companion to a wealthy invalid girl, the free-spirited Heidi must navigate an unfamiliar world far from her beloved mountains and the people she holds dear. (This is an automatically generated summary.)

Original publication data not identified