Schwietz, Roger L2012-03-142012-03-1419721972Source: Masters Abstracts International, Volume: 49-03, page: 1518.http://hdl.handle.net/10393/21879http://dx.doi.org/10.20381/ruor-17759Abstract not available.136 p.Philosophy.The problem of species according to Aristotelian-Thomistic philosophy and the biological theory of evolutionThesis