"Some criticism has been made because letters are sent out with a rubber stamp signature. We feel that it is not necessary to ask mother to sign several copies. It is her custom to sign the original copy, and our workers claim that it is their right to keep this signed copy on file in our office, so that if anybody should challenge its authenticity, we have on file the copy signed with her own hand. The other copies are usually stamped with a rubber stamp. I merely mention this in passing, that all may know how much there is in any criticisms that are made about "rubber-stamp" testimonies." W.C. White Sermon, May 30, 1913. Publ. In GCB June 1, 1913. Copy in DF 107d (p.7)