[01-12] The Desirability of an Ecological Survey of Illinois Based on Plant Association
The Desirability of an Ecological Survey of Illinois Based on Plant Association Author: Cowles, H.C.
[05-04] Conservation of Our Forests
Conservation of Our Forests Author: Cowles, Henry C.
[07-03] The International Phytogeographical Excursion
The International Phytogeographical Excursion Author: Cowles, H.C.
[024-09] Conservation of Illinois Areas of Botanical Value
Conservation of Illinois Areas of Botanical Value Author: Cowles, Henry C.
[026-034] Problems of Land Utilization in Antrim Country, Michigan
Problems of Land Utilization in Antrim Country, Michigan Author: Cowles, Harbert N.