In 1887 Martin Corrigan was granted a Certificate of Service by the Pennsylvania Mine Foreman Examining Board, an alternative certification which recognized men who had served as mine foremen for at least one year prior to the 1885 Mine Safety Act9 . Martin Corrigan did not own this book in order to take the Mine Foreman Exam himself. Martin may have originally purchased the book for his own private library, consulting its contents in his role as mine boss for Augustus S. Van Winkle's Milnesville collieries. But Martin also loaned this book out. The words "Please Return" were found inside the front and back covers.