1891 image of Power Building, now known as the Power Block, in <a href="https://en.wikipedia.org/wiki/Helena,_Montana" class="extiw" title="w:Helena, Montana">Helena, Montana</a>, U.S. Image credited to A. W. Lyman
1891 image in Figure 13 of source credited in source to "A. W. Lyman".
<ul><li>Connor, Glen (August 2006) "HISTORY OF WEATHER OBSERVATIONS HELENA, MONTANA". Figure 13. Notation in source: "prepared for the Midwestern Regional Climate Center under the auspices of the Climate Database Modernization Program, NOAA's National Climatic Data Center, Asheville, North Carolina."</li>
<li><a rel="nofollow" class="external free" href="https://mrcc.illinois.edu/FORTS/histories/MT_Helena_Conner.pdf">https://mrcc.illinois.edu/FORTS/histories/MT_Helena_Conner.pdf</a></li>
<li>Archive thereof: <a rel="nofollow" class="external free" href="https://web.archive.org/web/20200731212041/https://mrcc.illinois.edu/FORTS/histories/MT_Helena_Conner.pdf">https://web.archive.org/web/20200731212041/https://mrcc.illinois.edu/FORTS/histories/MT_Helena_Conner.pdf</a></li></ul>