Status report on project GRAND
  GRAND is an array of position sensitive proportional wire chambers (PWCs) located at 86.2 degrees W, 41.7 degrees N at an elevation of 220 m adjacent to the campus of the University of Notre Dame with 82 square meters of total muon detector area. The geometry of the PWCs allows the angles of the charged secondary muon tracks to be measured to +/- 0.3 deg in each of two orthogonal planes. Muons are 99% differentiated from electrons by means of a 51 mm steel plate in each detector. 
J. Poirier, C. D'Andrea, E. Fidler, J. Gress, M. Herrera, P. Hemphill,   C. Swartzendruber