1822-1884 19thcentury 2005l-281 20thcentury 540-604 altmann approximately540-604 austrian biography biology caregivers collins companytownarchitecture companytowns congresses gatedcommunities genetics geneticstheoriesofmendel gregorjohann gregory history holocaustsurvivors humangenetics jews maria medical mendel mendel'slaw pictorialworks qh428b787m1989 refugeecamps sailer unitedstates westernsahara