We have performed an E\"otv\"os-type experiment at a site with a significant slope in the terrain. For an intermediate-range force coupled to baryon number (N+Z) we find the product of strength ${\ensuremath{\alpha}}_{0}$ and range \ensuremath{\lambda} to be ${\ensuremath{\alpha}}_{0}$\ensuremath{\lambda}=-0.04\ifmmode\pm\else\textpm\fi{}0.07 m for 25<\ensuremath{\lambda}<400 m. At greater ranges the value and the error increase linearly to ${\ensuremath{\alpha}}_{0}$\ensuremath{\lambda}=-0.05\ifmmode\pm\else\textpm\fi{}0.09 m at 1.6 km. If the coupling is quark-flavor dependent, i.e., is purely to N-Z, we find, to well within the error, the same values for ${\ensuremath{\alpha}}_{0}$\ensuremath{\lambda}.