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ORCHID STUDIES, XI
Published in Botanical Museum Leaflets, Harvard University, in 1940, in volume 8, pages 106-108
THE GENUS PALMORCHIS
Published in Botanical Museum Leaflets, Harvard University, in 1940, in volume 8, pages 109-119
PLANTAE MEXICANAE V
Published in Botanical Museum Leaflets, Harvard University, in 1940, in volume 8, pages 134-140
ORCHID STUDIES, XII
Published in Botanical Museum Leaflets, Harvard University, in 1940, in volume 8, pages 141-151