1. Note on epi in To;Baron;Can. Math. Bull.,1968
2. Some aspects of groups with unique roots;Baumslag;Acta Math.,1960
3. Limit operators and topological coreflections;Herrlich;Trans. Amer. Math. Soc.,1969
4. H. Herrlich, private communication.
5. H. Herrlich, G. Salicrup, and G.E. Strecker, Factorizations, denseness, separation, and relatively compact objects, preprint.