Title: Sherlock Holmes Mystery Stories (Adventure of the Engineer's Thumb / Boscombe Valley Mystery)
First published: 1920
Description: Contains:
[Adventure of the Engineer's Thumb](https://openlibrary.org/works/OL1518318W/Adventure_of_the_Engineer's_Thumb)
[Boscombe Valley Mystery](https://openlibrary.org/works/OL18495288W/The_Boscombe_Valley_Mystery)