Published in Contributions from the University of Michigan Herbarium, in 1942, in volume 7, pages 1-56

Created: 2016-07-11, modified: 2016-07-11

Published in Contributions From The University of Michigan Herbarium, in 1942, in volume 8, pages 5-74

Created: 2016-07-11, modified: 2016-07-11

Published in Contributions From The University of Michigan Herbarium, in 1942, in volume 8, pages 75-88

Created: 2016-07-11, modified: 2016-07-11