I am primarily a rare monograph and map cataloger, but occasionally I do serials too. But my experience is very limited and I always question my serial cataloging decisions and I usually find myself overwhelmed with doubts. I joined this list to seek the support I don't have at my job, so, please excuse my ignorance on the subject. One of the problems I have is I'm not quite sure how to enter dates in the 260/264 field when I'm pretty confident about the beginning and end dates but I don't actually have the first or last issues. From my research I determined that the beginning date is 1786 and that the end date for that title (before continued by another) is 1865. So, how should indicate this in the record?