C.F. Rogers, the author of the book Baptism and Christian Archaeology, set out to prove that baptism had to be by immersion in the early Church. He discovered by studying the archaeology of house churches and tombs that this was not the case and came to the conclusion that baptism by immersion was not the predominant manner of baptizing.
The book was reprinted in 2006. You can get a nice preview of the text and archaeological drawings at Google Books.