On cover of v. 5-v. 7, no. 3: Bulletin of the State University of Iowa; v. 7, nos. 4-5: University of Iowa monographs; v. 8, no. 1- University of Iowa studies
Vols. 1-6, which are each in 4 numbers contain 12 to 25 papers each; beginning with v. 7, nos. 4-5, the papers are issued in the form of monographs
Vol. 18 has supplement
Electronic serial mode of access: World Wide Web via the University of Michigan Making of America site