Manual mapping of drumlins in synthetic landscapes to assess operator effectiveness by John Hillier, Mike J. Smith, R. Armugam, I. Barr, C.M. Boston, C.D. Clark, J. Ely, A. Fankl, Sarah L. Greenwood, L. Gosselin, C. Hattestrand, K. Hogan, A.L.C. Hughes, Stephen J. Livingstone, H. Lovell, M. McHenry, Y. Munoz, X.M. Pellicer, R. Pellitero, C. Robb, S. Roberson, D. Ruther, M. Spagnolo, Matthew R. Standell, C.R. Stokes, R. Storrar, Nicholas J. Tate, K. Wooldridge