While reading in the botanical library of the University of Minnesota during the summer of 1896, I noticed a number of titles which had escaped Mr. W. W. Calkins, while preparing his bibliography of North American lichens. These I added to some before noted in my own library and began a careful search which extended through the summers of 1897 and 1898; examining also the general library of the University of Minnesota.
Proceedings of the Iowa Academy of Sciences
©1898 Iowa Academy of Science, Inc.
"Additions to the Bibliography of North American Lichens,"
Proceedings of the Iowa Academy of Science, 6(1), 165-173.
Available at: https://scholarworks.uni.edu/pias/vol6/iss1/25