Originally published as:
Ph.D. thesis, Columbia University, 1967
Keywords: Cotriple cohomology, Beck modules
2000 MSC: 18C15,18C20
Republished in:
Reprints in Theory and Applications of Categories,
No. 2 (2003) pp 1-59
http://www.tac.mta.ca/tac/reprints/articles/2/tr2.dvi
http://www.tac.mta.ca/tac/reprints/articles/2/tr2.ps
http://www.tac.mta.ca/tac/reprints/articles/2/tr2.pdf