More Lost Books?

2 Chronicles 12:15 refers to the records of Shemaiah, 2 Chronicles 13:22 refers to the annotations of of the prophet Iddo, 1 Chronicles 29:29 refers to the records of Samuel the seer, Nathan the prophet and Gad the seer. I am curious who these people are and what, in Biblical times, seer and prophet refered to. I haven't had much time to research but will submit my findings once I have.