Baseball player Bobby Mathews shown in Spalding's base ball guide, and official league book for 1915-1916
A.G. Spalding &amp; Bros
<a rel="nofollow" class="external free" href="https://library.si.edu/digital-library/book/spaldingsbasebal19151chic">https://library.si.edu/digital-library/book/spaldingsbasebal19151chic</a>