Representative multiangular bidirectional-reflectance measurements from the BUG dataset for a returned Apollo lunar soil and a Mars soil analog. The broad angular coverage samples a wide range of incidence and emergence geometries, directly constraining the phase-angle dependence of particulate surface scattering. In contrast to single-geometry laboratory spectra, such datasets provide direct information on the angular scattering behavior required to model disk-integrated reflected-light observations of rocky exoplanets.