Published with no copyright notice Pre-1978 no mark. These are the front pages of the above mentioned publication and it can be seen there are no copyright marks.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
{{Information |Description=Front pages of ''The significance of the dated prehistory of Chetro Ketl, Chaco Caänon, New Mexico'' by Florence M. Hawley |Source=[http://128.121.13.244/awweb/main.jsp?flag=browse&smd=1&awdid=1 New York State Library] (sign...
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