quick query

A friend has written with the following query: "do you have any references concerning child evangelists and itinerant evangelists at the turn of last century"? (turn of the 19th/20th century, he means). Anybody have any leads or references? I remember corresponding on email several years ago with someone who was doing some large project precisely on that topic, but of course I can't find that email now that I need it. If you don't want to bother with the comments section, references can be sent to me at pharvey *AT* uccs *DOT* edu.