Damping-off in forest nurseries
Cover-title Thesis (Ph. D.)--University of California, 1919 United States Department of agriculture. Bulletin no. 934. Contribution from the Bureau of plant industry. Washington, D. C. Professional paper, June 16, 1921, with a special thesis t.-p., dated December, 1919, attached to the cover. Thesis approval page inserted (folded) "Literature cited": p. 91-99
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