1. 2015-03-31 Re: [R-sig-Geo] How to count unique TRUE's r-sig-geo Robert J. Hijmans 2. 2015-03-31 Re: [R-sig-Geo] How to count unique TRUE's r-sig-geo Forrest Stevens 3. 2015-03-31 Re: [R-sig-Geo] How to count unique TRUE's r-sig-geo Tom Philippi 4. 2015-03-31 [R-sig-Geo] How to count unique TRUE's r-sig-geo Walter Anderson