Mr. Omlor's collected writings, The Robber Church, may be read here:
http://www.huttongibson.com/PDFs/huttongibson_robberchurch_book.pdf
"Questioning the Validity..." is the first item in the collection.
Just letting you know that I have read the "Questioning the Validity..." book, but it was a while back so I'm re-reading it and then starting into the Robber Church now also. I'll get back with you later.