For the 1993 and 1995 surveys, my telephone number was the hotline and my e- mail address was available as well. For the 1997 survey, we are investigating the feasibility of a Web application. As you mull over suggestions for statistics, please keep in mind that confusion is the rule rather than the exception. Public, law, Federal agency, State, and academic libraries keep statistics differently. Whether a documents collection is separately classified or partially or wholly integrated into another classification system affects the counting.
Some libraries count slip treaties, slip opinions, preprints, etc., as a working count.
Only the bound volume is included in the library's overall count. Others count every piece. Some include map sheets, others don't. I could go on ad nauseam. I am partial to the KISS method.