Constitutional law
Completed in March, 1880, while Dean of the University of Michigan, Cooley had published his treatise "The General Principles of Constitutional Law in the United States of America". One edition of Cooley's treatise on the subject matter of Constitutional law was published in Boston by Little, Brown and Company in 1891. A Second Edition of the work was completed by a legal scholar and contemporary of Cooley's, Alexis C. Angell, in August, 1891. A third edition was published in Boston by Little, Brown and Company in 1898.