Image was prepared by Ellen Edmonson and Hugh Chrisp as part of the 1927-1940 New York Biological Survey conducted by the Conservation Department (the predecessor to today's New York State Department of Environmental Conservation). Permission for their use is granted by the New York State Department of Environmental Conservation.
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 (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.