★ U. S. GOVERNMENT PRINTING OFFICE: 1970 O - 389-735
[Illustration: Locomotive.]
[Illustration: Book Jacket.]
* * * * * *
Transcriber’s note:
—A few typographical errors were corrected without comment.
—Retained publication information from the printed edition.
—Moved some captions nearer to the corresponding pictures, and removed
(or adjusted) references to picture location in the printed book.