NATIONAL PARK SERVICE Ruins Stabilization in the Southwestern United States Publications in Archeology 10

On May 13, 1971, President Richard Nixon signed Executive Order 11593, entitled "Protection and Enhancement of the Cultural Environment." a far-reaching document charging all departments and agencies of the Federal Government with responsibility for preserving the Nation's historic properties. This book, compiled by two authorities on the stabilization of archeological ruins, is issued to further the purposes of that Executive Order.

The President's order makes the Secretary of the Interior responsible for developing professional guidelines and providing Federal, State, and local agencies with professional advice and technical information to assist in safeguarding these antiquities. The National Park Service provides the Department of the Interior with the staff and professional services to meet these responsibilities.

ROGERS C. B. MORTON
Secretary of the Interior