Understanding Telegram and Letter Classifications and Symbols in Western Union Communications1921-01-10unknownhttp://rightsstatements.org/vocab/NKC/1.0/enghttp://congressarchives.org/record/CAC_CC_023_3.3_4_7_0007The document explains the different symbols used to indicate the class of service for telegrams, such as Day Letter, Blue, Night Letter, and Night Message. It also mentions that if none of these symbols appear, it is a regular telegram. Additionally, it mentions a message about petitions being prepared by Indians to protest the actions of Congressman McClintock.