Risk and RewardDavid Hilgers, Bridget Horton, Hal Katz, Clare Knight · First published 1997Open the Tome
Fiume di Fiastra riparian system study, Marche Region, ItalyDavid Charles Hilgers · First published 1995Open the Tome
New perspectives on human abortionThomas W. Hilgers, Dennis J. Horan, David Mall · First published 1981Open the Tome
