Book has no stated Copyrighted. I assume it was at one time copyrighted though by the publisher;

The Railroad View Publishing Company, Short Line News Service. P.O. Box 541, Colorado Springs, Colorado.

Some images has a copyright mark/notice, but no year on them either in this publication, but the view of Cripple Creek on page 31 is known to have a Copyright Notice of May 1911 from other sources.