Published in Botanical Museum Leaflets, Harvard University, in 1955, in volume 17, pages 37-64

Published in Botanical Museum Leaflets, Harvard University, in 1955, in volume 17, pages 65-100

Published in Botanical Museum Leaflets, Harvard University, in 1955, in volume 17, issue 4, pages 1-11

Published in Botanical Museum Leaflets, Harvard University, in 1955, in volume 17, issue 4, pages 12-24

Published in Botanical Museum Leaflets, Harvard University, in 1955, in volume 17, issue 4, pages 27-36