This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Crop, converted to mono via LAB, minor moire removed via FFT filter, levels. Modifications made by Ubcule.
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.