Alan M. MacEachren William Pike Chaoqing Yu Isaac Brewer Mark Gahegan Stephen D. Weaver Brent Yarnal Building a geocollaboratory: Supporting Human-Environment Regional Observatory (HERO) collaborative science activities. 201-225 2006 30 Computers, Environment and Urban Systems 2 http://dx.doi.org/10.1016/j.compenvurbsys.2005.10.005 db/journals/urban/urban30.html#MacEachrenPYBGWY06