Found a short article by John Piper, "The American Revival of 1905":
http://www.desiringgod.org/resource-library/taste-see-articles/the-american-revival-of-1905
http://www.desiringgod.org/resource-library/taste-see-articles/the-american-revival-of-1905
Many have heard of the Great Welsh Revival of 1904-1905. It touched all classes and ages. Newspapers kept tally as the churches swelled with new converts—over 100,000 in one six-month period. . . .What is not as well known is the fact that the power of revival spread to America as well as many other countries. Welsh immigrants who lived in Pennsylvania were receiving news of the homeland. Suddenly in December 1904 an awakening began in Wilkes-Barre, and the Rev. J.D. Roberts in one month instructed 123 converts. . .