Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 21-44

Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 45-56

Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 57-95

Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 97-105

Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 112-114

Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 115-172