1879-1959 1880-1941 1886- 1909 20thcentury animalbehavior animalecology authors behavior bieberach bieberbach bieberbachconjecture biography childlabor clara clothingtrade congresses determination(personalitytrait)inchildren exilehessel experimental franz french friendsandassociatesroché frisch geometricfunctiontheory german germany helen henripierre hessel immigrantchildren insects jewishwomen juvenileliterature karlvon lemlich ludwig mlcs92/09654(p) newyork newyork(state) painters roché shirtwaistmakers'strike socialconditions sociobiology strikesandlockouts unitedstates womenclothingworkers womeninthelabormovement zoology