This series consists of tissue letter books containing record copies of letters written by the state treasurer to various individuals primarily concerning the transfer of funds from one account to another and the advancing of funds preliminary to the receipt of tax monies. Indeed, one volume consists almost exclusively of letters addressed to cashiers all over the state concerning routine bookkeeping matters. Since these books served the same purpose as carbon copies of outgoing letters do today, they served the state treasurer as handy reading and bookkeeping files. Unfortunately, the tissue paper method of duplication was not always legible and thus the use of these volumes is limited. In at least one instance, a copy of a letter on regular paper was inserted into a volume.