The Irish and the Making of American Sport, 1835-1920 - Patrick R. Redmond - Google Books

https://books.google.de/books?id=ATzTAgAAQBAJ&pg=PA200#v=onepage

Jerrold Casway coined the phrase “The Emerald Age of Baseball” to describe the 1890s, when so many Irish names dominated teams’ rosters. But one can easily agree—and expand—that the period from the mid–1830s well into the first decade of the 20th century…